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Novels
- A Fortune for Kregen (1979)
- A Fortune for Kregen (1979) with Alan Burt Akers and Dray Prescot
- A Fortune for Kregen (1979) with Alan Burt Akers
- A Life for Kregen (1979)
- A Life for Kregen (1979) with Alan Burt Akers and Dray Prescot
- A Life for Kregen (1979) with Alan Burt Akers
- A Sword for Kregen (1979)
- A Sword for Kregen (1979) with Alan Burt Akers and Dray Prescot
- A Sword for Kregen (1979) with Alan Burt Akers
- A Victory for Kregen (1980)
- A Victory for Kregen (1980) with Alan Burt Akers and Dray Prescot
- A Victory for Kregen (1980) with Alan Burt Akers
- Allies of Antares (1981)
- Allies of Antares (1981) with Alan Burt Akers and Dray Prescot
- Allies of Antares (1981) with Alan Burt Akers
- Arena of Antares (1974)
- Arena of Antares (1974) with Alan Burt Akers
- Arena of Antares (1974) with Dray Prescot
- Armada of Antares (1976)
- Armada of Antares (1976) with Alan Burt Akers
- Aufruhr auf Kregen [German] (1997) with Alan Burt Akers
- Avenger of Antares (1975)
- Avenger of Antares (1975) with Alan Burt Akers
- Beasts of Antares (1980)
- Beasts of Antares (1980) with Dray Prescot
- Beasts of Antares (1980) with Alan Burt Akers
- Begegnung im All [German] (1958)
- Behold the Stars (1965)
- Bladesman of Antares (1975)
- Bladesman of Antares (1975) with Alan Burt Akers
- Blazon (1970)
- Brennende Sterne [German] (1972) with H. K. Bulmer
- Captive Scorpio (1978)
- Captive Scorpio (1978) with Alan Burt Akers
- Challenge (1954) with H. K. Bulmer
- Challenge (1954)
- Challenge of Antares (1995)
- Challenge of Antares (2014) with Alan Burt Akers
- Cidade Submarina [Portuguese] (1977)
- Citadel of Doom (unpublished)
- City Under the Sea (1957)
- Crown of the Sword God (1980)
- Crown of the Sword God (1980) with Manning Norvil
- Cybernetic Controller (1952) with H. K. Bulmer and A. V. Clarke
- Cybernetic Controller (1952) with A. V. Clarke
- Cycle of Nemesis (1967)
- Das Männlichkeits-Gen [German] (1981)
- Das Robot-Gehirn [German] (1954) with H. K. Bulmer and A. V. Clarke
- Das Tor nach Venudine [German] (1972) with H. K. Bulmer
-
Das verhängnisvolle Feuer?Das verhaengnisvolle Feuer[German] (1965)
- Dayra von Scorpio [German] (1982) with Alan Burt Akers
- Defiance (1963)
- Delia of Vallia (1982)
- Delia of Vallia (1982) with Alan Burt Akers and Dray Prescot
- Delia of Vallia (1982) with Alan Burt Akers
- Delia von Vallia [German] (1988) with Alan Burt Akers
- Demons of Antares (2014) with Alan Burt Akers
- Demons' World (1964)
-
Der große Blitz?Der grosse Blitz[German] (1965) with H. K. Bulmer
- Der Hexer der Poseidon [German] (1965)
- Der Kriegsherr von Antares [German] (1991) with Alan Burt Akers
- Der Nova-Mann [German] (1987)
- Der Novamann [German] (1979)
- Der Prinz von Scorpio [German] (1976) with Alan Burt Akers
- Der Rebell von Antares [German] (1987) with Alan Burt Akers
- Der Rächer von Antares [German] (1978) with Alan Burt Akers
- Der Schwertkämpfer von Scorpio [German] (1976) with Alan Burt Akers
- Der Triumph von Scorpio [German] (1993) with Alan Burt Akers
- Der Zorn von Antares [German] (1995) with Alan Burt Akers
- Die Abtrünnigen von Kregen [German] (1979) with Alan Burt Akers
- Die andere Dimension [German] (1972) with H. K. Bulmer
- Die Armada von Scorpio [German] (1976) with Alan Burt Akers
- Die Banditen von Antares [German] (1994) with Alan Burt Akers
- Die Bestien von Antares [German] (1987) with Alan Burt Akers
- Die Dämonen von Antares [German] (1994) with Alan Burt Akers
- Die Ebenen des Todes [German] (1973) with H. K. Bulmer
- Die Fehde von Antares [German] (1995) with Alan Burt Akers
- Die Feuer von Scorpio [German] (1988) with Alan Burt Akers
- Die fliegenden Städte von Antares [German] (1978) with Alan Burt Akers
- Die Flieger von Antares [German] (1977) with Alan Burt Akers
- Die Geißel von Antares [German] (1995) with Alan Burt Akers
- Die Gezeiten von Kregen [German] (1979) with Alan Burt Akers
- Die Hexen von Kregen [German] (1990) with Alan Burt Akers
- Die Hypno-Falle [German] (1979)
- Die Intrige von Antares [German] (1993) with Alan Burt Akers
- Die Klauen von Scorpio [German] (1989) with Alan Burt Akers
- Die Labyrinthe von Scorpio [German] (1988) with Alan Burt Akers
- Die Legionen von Antares [German] (1987) with Alan Burt Akers
- Die letzte Hoffnung [German] (1966)
- Die Masken von Scorpio [German] (1989) with Alan Burt Akers
- Die Menschenjäger von Antares [German] (1976) with Alan Burt Akers
- Die Omen von Kregen [German] (1991) with Alan Burt Akers
- Die Propheten der Erde [German] (1963) with H. Kenneth Bulmer
- Die Sonnen von Scorpio [German] (1976) with Alan Burt Akers
- Die Trommeln von Scorpio [German] (1992) with Alan Burt Akers
- Die Verbündeten von Antares [German] (1987) with Alan Burt Akers
- Die Waffenbrüder von Antares [German] (1977) with Alan Burt Akers
- Die Werwölfe von Kregen [German] (1989) with Alan Burt Akers
- Dream Chariots (1977)
- Dream Chariots (1977) with Manning Norvil
- Earth's Long Shadow (1962)
- Ein Leben für Kregen [German] (1986) with Alan Burt Akers
- Ein Schicksal für Kregen [German] (1986) with Alan Burt Akers
- Ein Schwert für Kregen [German] (1986) with Alan Burt Akers
- Ein Sieg für Kregen [German] (1987) with Alan Burt Akers
- Empire of Chaos (1952)
- Empire of Chaos (1952) with H. K. Bulmer
- Encounter in Space (1952)
- Encounter in Space (1952) with H. K. Bulmer
- Fires of Scorpio (1983) with Alan Burt Akers and Dray Prescot
- Fires of Scorpio (1983)
- Fires of Scorpio (1983) with Alan Burt Akers
- Fliers of Antares (1975)
- Fliers of Antares (1975) with Alan Burt Akers
- Forschungskreuzer Saumarez [German] (1961) with H. K. Bulmer
- Forschungskreuzer Saumarez [German] (1961)
-
Freiheit für die Erde?Freiheit fuer die Erde[German] (1965) with H. K. Bulmer
- Galactic Intrigue (1953)
- Galactic Intrigue (1953) with H. K. Bulmer
- Gangs of Antares (1994)
- Gangs of Antares (2008) with Alan Burt Akers
- Gefangen im All [German] (1988)
- Geheimnisvolles Scorpio [German] (1980) with Alan Burt Akers
- Golden Scorpio (1978) with Alan Burt Akers
- Golden Scorpio (1978)
- Goldenes Scorpio [German] (1986) with Alan Burt Akers
-
Im Reich der Dämonen?Im Reich der Daemonen[German] (1966)
- In der Arena von Antares [German] (1977) with Alan Burt Akers
- Intrigue of Antares (1993)
- Intrigue of Antares (2008) with Alan Burt Akers
- Invasion von Scorpio [German] (1992) with Alan Burt Akers
- Irunium [French] (1979)
- Kandar (1969)
- Kontrollstation Altimus [German] (1973)
- Krozair of Kregen (1977)
- Krozair of Kregen (1977) with Alan Burt Akers
- Krozair von Kregen [German] (1980) with Alan Burt Akers
-
La cité folle?La cite folle[French] (1975)
- Land Beyond the Map (1965)
- Legions of Antares (1981) with Alan Burt Akers and Dray Prescot
- Legions of Antares (1981)
- Legions of Antares (1981) with Alan Burt Akers
- Lure of the Novamen (unpublished)
- Manhounds of Antares (1974)
- Manhounds of Antares (1974) with Alan Burt Akers
- Manhounds of Antares (1981) with Dray Prescot
- Masks of Scorpio (1984)
- Masks of Scorpio (1984) with Alan Burt Akers and Dray Prescot
- Masks of Scorpio (1984) with Alan Burt Akers
- Mazes of Scorpio (1982)
- Mazes of Scorpio (1982) with Alan Burt Akers and Dray Prescot
- Mazes of Scorpio (1982) with Alan Burt Akers
- Meuchelmörder von Scorpio [German] (1992) with Alan Burt Akers
- Mission Galaxis [German] (1988)
- Mord auf Kregen [German] (1997) with Alan Burt Akers
- Murder on Kregen (1997)
- Murder on Kregen (2014) with Alan Burt Akers
- No Man's World (1961)
- O mundo em chamas [Portuguese] (1960) with H. K. Bulmer
- Of Earth Foretold (1961)
- Omens of Kregen (1985)
- Omens of Kregen (1985) with Alan Burt Akers and Dray Prescot
- Omens of Kregen (2008) with Alan Burt Akers
- On the Symb-Socket Circuit (1972)
- Peril from Space (1954)
- Peril from Space (1954) with Karl Maras
- Prince of Scorpio (1973)
- Prince of Scorpio (1974) with Alan Burt Akers
- Quench the Burning Stars (1970)
- Rebel of Antares (1980) with Dray Prescot
- Rebel of Antares (1980)
- Rebel of Antares (1980) with Alan Burt Akers
- Rebell der Sterne [German] (1988)
- Rebellen des Weltraums [German] (1958) with H. K. Bulmer and A. V. Clarke
- Renegade of Kregen (1976)
- Renegade of Kregen (1976) with Alan Burt Akers
- Roller Coaster World (1972)
- Savage Scorpio (1978)
- Savage Scorpio (1978) with Alan Burt Akers
- Schatten über Kregen [German] (1996) with Alan Burt Akers
-
Schatzjäger der Galaxis?Schatzjaeger der Galaxis[German] (1972) with H. K. Bulmer
- Scorpio Ablaze (1992)
- Scorpio Ablaze (1998) with Alan Burt Akers and Dray Prescot
- Scorpio Ablaze (2008) with Alan Burt Akers
- Scorpio Assassin (1992)
- Scorpio Assassin (1996) with Alan Burt Akers and Dray Prescot
- Scorpio Assassin (2008) with Alan Burt Akers
- Scorpio Drums (1992)
- Scorpio Drums (2000) with Alan Burt Akers and Dray Prescot
- Scorpio Drums (2008) with Alan Burt Akers
- Scorpio in Flammen [German] (1992) with Alan Burt Akers
- Scorpio Invasion (1992)
- Scorpio Invasion (1996) with Alan Burt Akers and Dray Prescot
- Scorpio Invasion (2008) with Alan Burt Akers
- Scorpio Reborn (1995)
- Scorpio Reborn (1995) with Alan Burt Akers and Dray Prescot
- Scorpio Reborn (2008) with Alan Burt Akers
- Scorpio Triumph (1993)
- Scorpio Triumph (2008) with Alan Burt Akers
- Scourge of Antares (1995)
- Scourge of Antares (2014) with Alan Burt Akers
- Secret of the Novamen (unpublished)
- Secret Scorpio (1977)
- Secret Scorpio (1977) with Alan Burt Akers
- Seg der Bogenschütze [German] (1989) with Alan Burt Akers
- Seg the Bowman (1984)
- Seg the Bowman (1984) with Alan Burt Akers and Dray Prescot
- Seg the Bowman (1984) with Alan Burt Akers
- Shadows over Kregen (1996)
- Shadows over Kregen (2014) with Alan Burt Akers
- Sklaven der Tiefe [German] (1959)
- Space Salvage (1953) with H. K. Bulmer
- Space Salvage (1953)
- Space Treason (1952) with H. K. Bulmer and A. V. Clarke
- Space Treason (1952) with A. V. Clarke
- Stadt des Wahnsinns [German] (1979)
- Stained-Glass World (1976)
- Star City (1974)
- Star City (1974) with Tully Zetford
- Star City [German] (1980)
- Star Strike (unpublished)
- Star Trove (1970)
- Sterbendes Land Utopia [German] (1968)
- Storm Over Vallia (1985)
- Storm Over Vallia (1985) with Alan Burt Akers and Dray Prescot
- Storm Over Vallia (2007) with Alan Burt Akers
- Sturm über Vallia [German] (1990) with Alan Burt Akers
- Sword of the Barbarians (2011)
- Swords of the Barbarians (1970)
- Swordships of Scorpio (1973)
- Swordships of Scorpio (1973) with Alan Burt Akers
- Talons of Scorpio (1983)
- Talons of Scorpio (1983) with Alan Burt Akers and Dray Prescot
- Talons of Scorpio (1983) with Alan Burt Akers
- The Boosted Man (1974)
- The Boosted Man (1974) with Tully Zetford
- The Changeling Worlds (1959)
- The Chariots of Ra (1972)
- The Demons (1965)
- The Demons of Antares (1994)
- The Diamond Contessa (1983)
- The Doomsday Men (1968)
- The Earth Gods Are Coming (1960)
- The Fatal Fire (1962)
- The Gervase Factor (unpublished)
- The Insane City (1971)
- The Key to Irunium (1967)
- The Key to Venudine (1968)
- The Lost Fleet (unpublished)
- The Million Year Hunt (1964)
- The Patient Dark (1969)
- The Secret of ZI (1958)
- The Star Venturers (1969)
- The Suns of Scorpio (1973)
- The Suns of Scorpio (1973) with Alan Burt Akers
- The Thoughtless Island (1957)
- The Tides of Kregen (1976)
- The Tides of Kregen (1976) with Alan Burt Akers
- The Ulcer Culture (1969)
- The Wind of Liberty (1962)
- The Wizard of Starship Poseidon (1963)
- To Outrun Doomsday (1967)
- Tod auf Widerruf [German] (1969)
- Todesfalle Jupiter [German] (1955) with H. K. Bulmer
- Transit nach Scorpio [German] (1975) with Alan Burt Akers
- Transit to Scorpio (1972)
- Transit to Scorpio (1972) with Alan Burt Akers
- Transit zu den Sternen [German] (1967) with H. K. Bulmer
- Turmoil on Kregen (1997)
- Turmoil on Kregen (2014) with Alan Burt Akers
- Verbotene Welten [German] (1960)
- Vermächtnis der Zukunft [German] (1988)
-
Verte destinée?Verte destinee[French] (1958)
- Virility Gene (1975)
- Virility Gene (1975) with Tully Zetford
- Warlord of Antares (1988)
- Warlord of Antares (1988) with Dray Prescot
- Warlord of Antares (2008) with Alan Burt Akers
- Warrior of Scorpio (1973)
- Warrior of Scorpio (1973) with Alan Burt Akers
- Wegweiser ins Grauen [German] (1965)
- Welt des Schreckens [German] (1957) with H. K. Bulmer
- Weltraum-Friedhof [German] (1988)
- Weltraum-Piraten [German] (1988)
- Werewolves of Kregen (1985)
- Werewolves of Kregen (1985) with Alan Burt Akers and Dray Prescot
- Werewolves of Kregen (1985) with Alan Burt Akers
- Whetted Bronze (1978)
- Whetted Bronze (1978) with Manning Norvil
- Whirlpool of Stars (1974)
- Whirlpool of Stars (1974) with Tully Zetford
- Wiedergeborenes Scorpio [German] (1991) with Alan Burt Akers
- Wildes Scorpio [German] (1981) with Alan Burt Akers
- Wisdom of the Gods (1958)
- Witches of Kregen (1985)
- Witches of Kregen (1985) with Alan Burt Akers and Dray Prescot
- Witches of Kregen (2007) with Alan Burt Akers
- World Aflame (1954) with H. K. Bulmer
- World Aflame (1954)
- Worlds for the Taking (1966)
- Wrath of Antares (1995)
- Wrath of Antares (2014) with Alan Burt Akers
- Zhorani: Master of the Universe (1953)
- Zhorani: Master of the Universe (1953) with Karl Maras
- Zwischenfall auf Luralye [German] (1958) with H. K. Bulmer
- Of Earth Foretold (1961)
- Verbotene Welten [German] (1960)
- Beyond Capella / The Electric Sword-Swallowers (1971) [O/2N] with John T. Phillifent
- Beyond Capella / The Electric Sword-Swallowers (1971) [O/2N] with John Rackham
- Beyond the Silver Sky / Meeting at Infinity (1961) [O/2N] with John Brunner
- Beyond the Vanishing Point / The Secret of ZI (1958) [O/2N] with Ray Cummings
- City Under the Sea / Star Ways (1957) [O/2N] with Poul Anderson
- Cradle of the Sun / The Wizards of Senchuria (1969) [O/2N] with Brian Stableford
- Cradle of the Sun / The Wizards of Senchuria (1969) [O/2N] with Brian M. Stableford
- Demons' World / I Want the Stars (1964) [O/2N] with Tom Purdom
- Die Scorpio-Bänder [German] (1996) [O/1-3]
- Die Scorpio-Bänder [German] (1996) [O/1-3] with Alan Burt Akers
- Earthstrings / The Chariots of Ra (1972) [O/2N] with John T. Phillifent
- Earthstrings / The Chariots of Ra (1972) [O/2N] with John Rackham
- Fugitive of the Stars / Land Beyond the Map (1965) [O/2N] with Edmond Hamilton
- Let the Spacemen Beware! / The Wizard of Starship Poseidon (1963) [O/2N] with Poul Anderson
- Manhounds of Antares and Arena of Antares (1981) [O/6,7]
- Manhounds of Antares and Arena of Antares (1981) [O] with Dray Prescot
- Mayday Orbit / No Man's World (1961) [O/2N] with Poul Anderson
- New Writings in SF Special (3) (1978) [O/27,28]
- New Writings in SF: Special One (1975) [O/21,22,23] with John Carnell
- New Writings in SF: Special Two (1978) [O/26,29]
- Planetary Agent X / Behold the Stars (1965) [O] with Mack Reynolds
- Project Jove / The Hunters of Jundagai (1971) [O/2N] with John S. Glasby
- Project Jove / The Hunters of Jundagai (1971) [O/2N] with John Glasby
- Ryder Hook - Der Nova-Mann [German] (1987) [O/1-4]
- Ships to the Stars / The Million Year Hunt (1964) [O/1N,1C] with Fritz Leiber
- The Balintol Cycle I (2015) [O/44-46]
- The Balintol Cycle I (2015) [O] with Alan Burt Akers
- The Balintol Cycle II (2015) [O/47-49]
- The Balintol Cycle II (2015) [O] with Alan Burt Akers
- The Delian Cycle (2007) [O/1-5]
- The Delian Cycle (2007) [O] with Alan Burt Akers
- The Fall of the Dream Machine / The Star Venturers (1969) [O/2N] with Dean R. Koontz
- The Games of Neith / The Earth Gods Are Coming (1960) [O/2N] with Margaret St. Clair
- The Havilfar Cycle (2010) [O/6-11]
- The Havilfar Cycle (2010) [O/6-11] with Alan Burt Akers
- The Havilfar Cycle I (2007) [O/6-8]
- The Havilfar Cycle I (2007) [O] with Alan Burt Akers
- The Havilfar Cycle II (2007) [O/9-11]
- The Havilfar Cycle II (2007) [O] with Alan Burt Akers
- The Jikaida Cycle (2009) [O/19-22]
- The Jikaida Cycle (2009) [O] with Alan Burt Akers
- The Key to Irunium / The Wandering Tellurian (1967) [O/2N] with Alan Schwartz
- The Key to Venudine / Mercenary from Tomorrow (1968) [O/2N] with Mack Reynolds
- The Krozair Cycle (2007) [O/12-14]
- The Krozair Cycle (2007) [O] with Alan Burt Akers
- The Lohvian Cycle I (2011) [O/38-40]
- The Lohvian Cycle I (2011) [O] with Alan Burt Akers
- The Lohvian Cycle II (2012) [O/41-43]
- The Lohvian Cycle II (2012) [O] with Alan Burt Akers
- The Pandahem Cycle I (2011) [O/27-29]
- The Pandahem Cycle I (2011) [O/27-29] with Alan Burt Akers
- The Pandahem Cycle II (2011) [O/30-32]
- The Pandahem Cycle II (2011) [O/30-32] with Alan Burt Akers
- The Ships of Durostorum / Alton's Unguessable (1970) [O/2N] with Jeff Sutton
- The Spectre Cycle (2015) [O/50-52]
- The Spectre Cycle (2015) [O] with Alan Burt Akers
- The Spikatur Cycle (2010) [O/23-26]
- The Spikatur Cycle (2010) [O] with Alan Burt Akers
- The Vallian Cycle (2009) [O/15-18]
- The Vallian Cycle (2009) [O] with Alan Burt Akers
- The Witch War Cycle (2009) [O/33-37]
- The Witch War Cycle (2009) [O] with Alan Burt Akers
- Vanguard from Alpha / The Changeling Worlds (1959) [O/2N] with Brian W. Aldiss
- Gli schiavi degli abissi (Complete Novel) [Italian] (1959)
- Green Destiny (Part 1 of 3) (1957)
- Green Destiny (Part 2 of 3) (1957)
- Green Destiny (Part 3 of 3) (1957)
- Il segreto di Zi (Complete Novel) [Italian] (1960)
- La grande sfida (Complete Novel) [Italian] (1964)
- Le gabbie dell'infinito (Complete Novel) [Italian] (1967)
- Les hommes du jugement dernier (Part 1 of 2) [French] (1974)
- Les hommes du jugement dernier (Part 2 of 2) [French] (1974)
- Lunga caccia nello spazio (Complete Novel) [Italian] (1992)
- Rapina da virus (Complete Novel) [Italian] (1965)
- Selezione implacabile (Complete Novel) [Italian] (1963) with H. K. Bulmer and A. V. Clarke
- Stazione spaziale 539 (Complete Novel) [Italian] (1959) with H. K. Bulmer
- The Fatal Fire (Part 1 of 3) (1960)
- The Fatal Fire (Part 2 of 3) (1960)
- The Fatal Fire (Part 3 of 3) (1960)
- The Golden Age (Part 1 of 2) (1961) with Rupert Clinton
- The Golden Age (Part 2 of 2) (1961) with Rupert Clinton
- The Patient Dark (Part 1 of 3) (1959)
- The Patient Dark (Part 2 of 3) (1959)
- The Patient Dark (Part 3 of 3) (1959)
- The Thoughtless Island (Complete Novel) (1957) with H. Philip Stratford
- Wisdom of the Gods (Part 1 of 4) (1958)
- Wisdom of the Gods (Part 2 of 4) (1958)
- Wisdom of the Gods (Part 3 of 4) (1958)
- Wisdom of the Gods (Part 4 of 4) (1958)
- Foundation, #1 March 1972 (1972) with Charles Barren and George Hay
- Foundation, #2 June 1972 (1972) with Charles Barren and George Hay
- Foundation, #3 March 1973 (1973) with Charles Barren and George Hay
- Foundation, #4 July 1973 (1973) with Charles Barren and George Hay
- Feiticeiros do Espaço [Portuguese] (1971)
- New Writings in SF (26) (1975)
- New Writings in SF (27) (1975)
- New Writings in SF (28) (1976)
- New Writings in SF (29) (1976)
- New Writings in SF - 22 (1974)
- New Writings in SF 22 (1973)
- New Writings in SF 23 (1973)
- New Writings in SF 24 (1974)
- New Writings in SF 25 (1975)
- New Writings in SF 26 (1976)
- New Writings in SF 27 (1977)
- New Writings in SF 28 (1977)
- New Writings in SF 29 (1978)
- New Writings in SF 30 (1977)
- New Writings in SF-24 (1975)
- Beyond the Silver Sky (2011)
- Die Jäger von Jundagai [German] (1973)
- Die Jäger von Jundagai [German] (1973) with H. K. Bulmer
- Die Spektral-Falle [German] (1961) with Philip Kent
- Die Sterne gehören uns [German] (1955) with H. K. Bulmer
- Die Wassermenschen von Nablus [German] (1962) with H. Kenneth Bulmer
- Die Zauberer von Senchuria [German] (1972)
- Die Zauberer von Senchuria [German] (1972) with H. K. Bulmer
- Hinter den silbernen Himmeln [German] (1986)
- Home Is the Martian (1954)
- Home Is the Martian (1954) with Philip Kent
- Inside Out (2019) with Richard Wilson
- Mission to the Stars (1954)
- Mission to the Stars (1954) with Philip Kent
- Planet der Kriegsspiele [German] (1972) with H. K. Bulmer
- Robotar, UPA [Swedish] (1974)
- Slaves of the Spectrum (1954)
- Slaves of the Spectrum (1954) with Philip Kent
- The Electric Sword-Swallowers (2012)
- The Hunters of Jundagai (2012)
- The Ships of Durostorum (2012)
- The Stars Are Ours (1953)
- The Stars Are Ours (1953) with H. K. Bulmer
- The Wizards of Senchuria (2012)
- Tramps zwischen den Welten [German] (1972)
- Tramps zwischen den Welten [German] (1972) with H. K. Bulmer
- Vassals of Venus (1954)
- Vassals of Venus (1954) with Philip Kent
- Von Robotern beherrscht [German] (1977) with H. K. Bulmer
- Foundation: The Review of Science Fiction, Numbers 1-8 (1978) with Charles Barren and George Hay and Peter Nicholls
- The True Book About Space Travel (1960) with John Newman
- The True Book About Space Travel (1960) with Kenneth Johns
- "Green Shadows" (1983)
- "Green Shadows" (2011) with Alan Burt Akers
- "Lallia the Slave Girl" (1982) with Alan Burt Akers
- A Case of Identity (1964)
- A Memory of Golden Sunshine (1971)
- A skorpió varázslója [Hungarian] (1989) with Alan Burt Akers
- According to Tradition (1956)
- According to Tradition (1956) with Philip Stratford
- Advertise Your Cyanide (1958)
- Agent Provocateur (1958)
- Agent Provocateur (1958) with H. Philip Stratford
- All Glory Forgotten (1954)
- Ambiguous Assignment (1957)
- Aquaman (1974)
- Artillero novato [Spanish] (1972)
- Asylum (1955)
- Asymptote (1957)
- Asymptote (1957) with H. Philip Stratford
- Beyond the Silver Sky (1960)
- Bitter the Path (1954)
- Bortom ära och redlighet [Swedish] (1961)
- Brother Can You Spare a Word (1988)
- Brother Can You Spare a Word (1988) with Ken Bulmer
- By the Beard of the Comet (1957)
- Castle of Vengeance (1959)
- Child's Play (1957)
- Come to Prestonwell (1955)
- Culpable in Glass (1970)
- Defiance (1957)
- Der Sonnen-Zünder [German] (1960)
- Der Zauberer von Scorpio [German] (1982) with Alan Burt Akers
- Design Dilemma (1961)
- Design Dilemma (1961) with Nelson Sherwood
- Die Jäger von Jundagai [German] (1973) with H. K. Bulmer
- Die Spektral-Falle [German] (1961) with Philip Kent
-
Die Sterne gehören uns?Die Sterne gehoeren uns[German] (1955) with H. K. Bulmer
- Die Wassermenschen von Nablus [German] (1962) with H. Kenneth Bulmer
- Die Zauberer von Senchuria [German] (1972) with H. K. Bulmer
- Don't Cross a Telekine (1959)
- Don't Cross a Telekine (1959) with Philip Stratford
- Draft Dodger (1966)
- Earth's Long Shadow (1960)
- El bebé del señor Culpeper [Spanish] (1981)
- Feiticeiros do Espaço [Portuguese] (1971)
- Firecracker Fool (1955)
- Firecracker Fool (1955) with Peter Green
- First Down (1954)
- Flame in the Flux Field (1962)
- From Loveless Heaven (1999)
- Galactic Galapagos (1959)
- Galactic Galapagos (1959) with Nelson Sherwood
- Grabschmaus [German] (1976)
- Green Shadows (1983) with Alan Burt Akers
- Greenie Gunner (1960)
- Hiatus (1961)
- Hiatus (1961) with Frank Brandon
- Hinter den silbernen Himmeln [German] (1986)
- Home Is the Martian (1954)
- Home Is the Martian (1954) with Philip Kent
- I Fought the Deadly Shade (1958)
- I Fought the Deadly Shade (1958) with H. Ken Bulmer
- Ice and Fire (1989)
- Ice and Fire (1989) with Ken Bulmer
- Il mistero della "Cornwallis" [Italian] (1958)
- Inside Out (1966) with Richard Wilson
- It Takes Two (1954)
- It Takes Two (1954) with H. K. Bulmer
- Know Thy Neighbour (1955)
- Lallia the Slave Girl (1982)
- Lallia the Slave Girl (1982) with Alan Burt Akers
- Last Wish (1950)
- Last Wish (1950) with H. Ken Bulmer
-
Le jour où tout s'écroula...?Le jour ou tout s'ecroula...[French] (1959) with Damon Knight
- Le magicien de Scorpio [French] (1982) with Alan Burt Akers
- Les adaptés [French] (1972)
- Les proies [French] (1963)
- Lethe Lend (1957)
- Lethe Lend (1957) with H. Philip Stratford
- Lucky Number (1956)
- Lucky Number (1956) with H. Philip Stratford
- Medicine Man (1959)
- Medicine Man (1959) with H. Philip Stratford
- Mission One Hundred (1957)
- Mission to the Stars (1954)
- Mission to the Stars (1954) with Philip Kent
- Mr. Culpeper's Baby (1956)
- Naked As a Sword (1977)
- Naked as a Sword (1977) with Ken Bulmer
- Native Law (1957)
- Never Trust a Robot (1958)
- Not Human (1966)
- Of Earth Foretold (1960)
- Ordeal (1955)
- Our Friends the Aliens (1954)
- Our Friends the Aliens (1954) with H. Ken Bulmer
- Out of Control (1958)
- Perilous Portal (1962)
- Perilous Portal (1962) with Frank Brandon
- Planet der Kriegsspiele [German] (1972) with H. K. Bulmer
- Plaything (1955)
- Prestige (1957)
- Profession: Spaceman (1960)
- Project Pseudoman (1956)
- Psi No More (1955)
- Psycho Sis (1978)
- Psyksyster [Swedish] (1980)
- Quarry (1956)
- Reason for Living (1957)
- Recreation (1956)
- Robotar, UPA [Swedish] (1974)
- Scarlet Dawn (1962)
- Scarlet Dawn (1962) with Nelson Sherwood
- Scarlet Denial (1962)
- Scarlet Denial (1962) with Nelson Sherwood
- Shapers of Men (1969)
- Slaves of the Spectrum (1954)
- Slaves of the Spectrum (1954) with Philip Kent
- Some Other Time (1954)
- Song of Ages (1959)
- Song of Ages (1959) with H. Philip Stratford
- Space Command (1958)
- Spacemate (1950)
- Spacemate (1950) with H. Ken Bulmer
- Station HR972 (1967)
- Strange Highway (1960)
- Sunk (1956)
- Sunset (1955)
- Survey Corpse (1959)
- Swords for a Guide (1969)
- Terrore sul mondo [Italian] (1961) with H. K. Bulmer
- The Adjusted (1966)
- The Aztec Plan (1961)
- The Black Spot (1955)
- The Bones of Shosun (1958)
- The City Calls (1956)
- The Clock Struck One (1951) with H. Ken Bulmer
- The Clock Struck One (1952)
- The Contraption (1964)
- The Covetous (1958)
- The Covetous (1958) with H. Philip Stratford
- The Day Everything Fell Down (1957) with Damon Knight
- The Day Everything Fell Down (1957) with H. Ken Bulmer and Damon Knight
- The Day of the Monster (1955)
- The Dedicated Ones (1960)
- The Dedicated Ones (1960) with Nelson Sherwood
- The Doomsday Men (1965)
- The Electric Sword-Swallowers (1971)
- The Fowling (Excerpt) (1973)
- The Gatecrashers (1951) with Walt Willis
- The Gatecrashers (1951) with Ken Bulmer and Walter Willis
- The Gentle Approach (1959)
- The Golden Age (1961)
- The Great Armadas (1956)
- The Great Game (1958)
- The Halting Hand (1959)
- The Hidden Power (1956)
- The Hidden Power (1956) with H. Phillip Stratford
- The Hunters of Jundagai (1971)
- The Map Country (1961)
- The Old Firm (1956)
- The Old Firm (1956) with H. K. Bulmer
- The Scales of Friendship (1970)
- The Secret of Cornwallis (1958)
- The Seventh Stair (1961)
- The Seventh Stair (1961) with Frank Brandon
- The Ships of Durostorum (1970)
- The Singleton Path (2004)
- The Singleton Path (2004) with Adam Hardy
- The Smallest Ally (1956)
- The Stars Are Ours (1953)
- The Stars Are Ours (1953) with H. K. Bulmer
- The Story of Lallia the Slave Girl (1982) with Dray Prescot
- The Sun Creator (1959)
- The Sun Creator (1959) with Nelson Sherwood
- The Ties of Iron (1957)
- The Unreluctant Tread (1958)
- The Wizards of Senchuria (1969)
- Their Dreams Remain (1956)
- There's No Business (1957)
- Three-Cornered Knife (1957)
- Time Travel Business (1955)
- Time Travel Business (1955) with H. Philip Stratford
- To Shake the Stars (1954)
- To Shake the Stars (1954) with Peter Green
- Total Recall (1955)
- Tramps zwischen den Welten [German] (1972) with H. K. Bulmer
- Trial (1961)
- Trial (1961) with Nelson Sherwood
- Trots allt [Swedish] (1963)
- Under the Tombstone (1971)
- Vale! (1957)
- Vale! (1957) with H. Philip Stratford
- Vassals of Venus (1954)
- Vassals of Venus (1954) with Philip Kent
- Von Robotern beherrscht [German] (1977) with H. K. Bulmer
- Welt der Illusionen [German] (1967) with H. Kenneth Bulmer
- Wind of Liberty (1961)
- Wizard of Scorpio (1976)
- Wizard of Scorpio (1976) with Alan Burt Akers
- Wrong Impression (1956)
- Wrong Impression (1956) with H. Philip Stratford
- "On the Pen-Name Trail" (1983)
- "On the Pen-Name Trail" (1983) with Ken Bulmer
- [Die neuere, interessantere Theorie, wonach...] [German] (1965)
- [Die zwei Grundideen meines Romans...] [German] (1965)
- A Brief Note on the Tapes from Africa (1973)
- A Brief Note on the Tapes from Africa (1973) with Alan Burt Akers
- A Glossary of Persons, Places, and Things in the Saga of Prescot of Antares (1974)
- A Glossary of Persons, Places, and Things in the Saga of Prescot of Antares (1974) with Alan Burt Akers
- A Glossary to the Havilfar Cycle of the Saga of Dray Prescot (1976)
- A Glossary to the Havilfar Cycle of the Saga of Dray Prescot (1976) with Alan Burt Akers
- A Glossary to the Vallian Cycle of the Saga of Drag Prescot (1978)
- A Note on Dray Prescot (1974)
- A Note on Dray Prescot (1974) with Alan Burt Akers
- A Note on Dray Prescot (1975) with Alan Burt Akers
- A Note on Dray Prescot (1976) with Alan Burt Akers
- A Note on Dray Prescot (A Fortune for Kregen) (1979)
- A Note on Dray Prescot (A Fortune for Kregen) (1979) with Alan Burt Akers
- A Note on Dray Prescot (A Victory for Kregen) (1980)
- A Note on Dray Prescot (A Victory for Kregen) (1980) with Alan Burt Akers
- A Note on Dray Prescot (Armada of Antares) (1976) with Alan Burt Akers
- A Note on Dray Prescot (Omens of Kregen) (1985)
- A Note on Dray Prescot (Omens of Kregen) (1985) with Alan Burt Akers
- A Note on Dray Prescot (Scorpio Ablaze) (1998)
- A Note on Dray Prescot (Scorpio Ablaze) (1998) with Alan Burt Akers
- A Note on Dray Prescot (Scorpio Assassin) (1996)
- A Note on Dray Prescot (Scorpio Assassin) (1996) with Alan Burt Akers
- A Note on Dray Prescot (Scorpio Drums) (2000)
- A Note on Dray Prescot (Scorpio Drums) (2000) with Alan Burt Akers
- A Note on Dray Prescot (Scorpio Invasion) (1996)
- A Note on Dray Prescot (Scorpio Invasion) (1996) with Alan Burt Akers
- A Note on Dray Prescot (Scorpio Reborn) (1995)
- A Note on Dray Prescot (Scorpio Reborn) (1995) with Alan Burt Akers
- A Note on Prescot's Map of Part of Kregen (1974)
- A Note on Prescot's Map of Part of Kregen (1974) with Alan Burt Akers
- A Note on the Havilfar Cycle (1974)
- A Note on the Havilfar Cycle (1974) with Alan Burt Akers
- A Note on the Krozair Cycle (1976)
- A Note on the Krozair Cycle (1976) with Alan Burt Akers
- A Note on the Pandahem Cycle (1982)
- A Note on the Pandahem Cycle (1982) with Alan Burt Akers
- A Note on the Tapes from Africa (1972)
- A Note on the Tapes from Africa (1972) with Alan Burt Akers
- A Note on the Tapes from Africa (1973) with Alan Burt Akers
- A Note on the Tapes from Rio De Janeiro (1973)
- A Note on the Tapes from Rio De Janeiro (1973) with Alan Burt Akers
- A Note on the Vallian Cycle (1977)
- A Note on the Vallian Cycle (1977) with Alan Burt Akers
- Advice to a Beginning Writer (1970)
- Advice to a Beginning Writer (1970) with Ken Bulmer
- Antarctica (1957) with Kenneth Johns
- Antarctica (1957) with John Newman
- Anyone at Home? (1960) with John Newman
- Anyone at Home? (1960) with Kenneth Johns
- Appendix: Jikaida (1979)
- Appendix: Jikaida (1979) with Alan Burt Akers
- Artificiella månar [Swedish] (1957) with K. Kindberg and John Newman
- Artificiella månar [Swedish] (1957) with Kenneth Johns and K. Kindberg
- Audrey (1955) with John Newman
- Audrey (1955) with Kenneth Johns
- Author's Footnote (The Fatal Fire) (1960)
- Bacon in Bulmer Sauce (1973)
- Balloons Make a Come-Back (1956) with John Newman
- Balloons Make a Come-Back (1956) with Kenneth Johns
- Bigger Birds (1961) with John Newman
- Bigger Birds (1961) with Kenneth Johns
- Biologically Speaking (1959) with John Newman
- Biologically Speaking (1959) with Kenneth Johns
- Blackberry Crisp Ambrosia (1973)
- Bow Bells (1958)
- Bow Bells (1958) with H. Ken Bulmer
- Bow Bells No. 1 (1959)
- Bow Bells No. 1 (1959) with Ken Bulmer
- Case of the Missing Planets (1956) with John Newman
- Case of the Missing Planets (1956) with Kenneth Johns
- CETEX (1959) with John Newman
- CETEX (1959) with Kenneth Johns
- Contra-Terrene Matter (1957) with John Newman
- Contra-Terrene Matter (1957) with Kenneth Johns
- Cradle of the Stars (1957) with John Newman
- Cradle of the Stars (1957) with Kenneth Johns
- Dark the Prince (1985)
- Dark the Prince (1985) with Alan Burt Akers
- Dray Pescot (Scorpio Ablaze) (1998)
- Dray Pescot (Scorpio Ablaze) (1998) with Alan Burt Akers
- Dray Prescot (1974)
- Dray Prescot (1974) with Alan Burt Akers
- Dray Prescot (1975) with Alan Burt Akers
- Dray Prescot (A Life for Kregen) (1979)
- Dray Prescot (A Life for Kregen) (1979) with Alan Burt Akers
- Dray Prescot (A Sword for Kregen) (1979)
- Dray Prescot (A Sword for Kregen) (1979) with Alan Burt Akers
- Dray Prescot (Avenger of Antares) (1975) with Alan Burt Akers
- Dray Prescot (Gangs of Antares) (2008)
- Dray Prescot (Gangs of Antares) (2008) with Alan Burt Akers
- Dray Prescot (Golden Scorpio) (1978)
- Dray Prescot (Golden Scorpio) (1978) with Alan Burt Akers
- Dray Prescot (Intrigue of Antares) (2008)
- Dray Prescot (Intrigue of Antares) (2008) with Alan Burt Akers
- Dray Prescot (Scorpio Assassin) (1996)
- Dray Prescot (Scorpio Assassin) (1996) with Alan Burt Akers
- Dray Prescot (Scorpio Drums) (2008)
- Dray Prescot (Scorpio Drums) (2008) with Alan Burt Akers
- Dray Prescot (Scorpio Invasion) (1996)
- Dray Prescot (Scorpio Invasion) (1996) with Alan Burt Akers
- Dray Prescot (Scorpio Reborn) (1995)
- Dray Prescot (Scorpio Reborn) (1995) with Alan Burt Akers
- Dray Prescot (Scorpio Triumph) (2008)
- Dray Prescot (Scorpio Triumph) (2008) with Alan Burt Akers
- Dreams of Empire (1979)
- Dreams of Empire (1979) with Ken Bulmer
- Extracts from Letters (1954) with Pamela Bulmer
- Far Distant Fires (1957) with John Newman
- Far Distant Fires (inside front cover) (1957) with Kenneth Johns
- Fires of Scorpio.... (1983)
- Fires of Scorpio.... (1983) with Alan Burt Akers
- Fit For Space (1961) with John Newman
- Fit For Space (1961) with Kenneth Johns
- Food in Space (1956)
- Food in Space (1956) with Kenneth Johns
- Foreword (New Writings in SF 22) (1973)
- Foreword (New Writings in SF 23) (1973)
- Foreword (New Writings in SF 24) (1974)
- Foreword (New Writings in SF 25) (1975)
- Foreword (New Writings in SF 26) (1975)
- Foreword (New Writings in SF 27) (1975)
- Foreword (New Writings in SF 28) (1976)
- Foreword (New Writings in SF 29) (1976)
- Foreword (New Writings in SF 30) (1977)
- Foreword: Dray Prescot (1975)
- Foreword: Dray Prescot (1975) with Alan Burt Akers
- Future Indefinite (1956) with Kenneth Johns
- Future Indefinite (1956) with John Newman
- Galaxies at Random (1959) with John Newman
- Galaxies at Random (1959) with Kenneth Johns
- Galaxies Galore (1957) with Kenneth Johns
- Galaxies Galore (1957) with John Newman
- Gravity (1961) with John Newman
- Gravity (1961) with Kenneth Johns
- Guest of Honour Speech – Eastercon 1968 (2015) with Ken Bulmer
- Guest of Honour Speech, Easter Convention 1968 (1968)
- Guest of Honour Speech, Easter Convention 1968 (1968) with Ken Bulmer
- Guided Missiles (1956) with Kenneth Johns
- Guided Missiles (1956) with John Newman
-
Havets roll i vår framtida ekonomi?Havets roll i var framtida ekonomi[Swedish] (1959) with John Newman
-
Havets roll i vår framtida ekonomi?Havets roll i var framtida ekonomi[Swedish] (1959) with Kenneth Johns
- In Memoriam: William F. Temple (1914-1989) (1989)
- In Our Blood Stream (1969)
- Jupiter the Mighty (1957) with John Newman
- Jupiter the Mighty (1957) with Kenneth Johns
- Keep a Cool Brain (1958) with John Newman
- Keep a Cool Brain (1958) with Kenneth Johns
- Ken Slater (1987)
- Ken Slater (1987) with Ken Bulmer
- Key to Precot's Map of Havilfar (1976)
- Key to Precot's Map of Havilfar (1976) with Alan Burt Akers
- Letter (Science Fiction Review #15) (1975)
- Letter (Science Fiction Review #15) (1975) with H. K. Bulmer
- Letter (Science Fiction Review, January 1969) (1969)
- Letter (Science Fiction Review, January 1969) (1969) with H. K. Bulmer
- Letter (Science Fiction Review, October 1970) (1970)
- Letter (Science Fiction Review, October 1970) (1970) with H. K. Bulmer
- Letter (SF Writer's Bulletin #7) (1971)
- Letter (SF Writer's Bulletin #7) (1971) with Ken Bulmer
- Letter (Speculation 30) (1972)
- Letter (Speculation 30) (1972) with Ken Bulmer
- Letter (Speculation, January 1967) (1967)
- Letter (Speculation, January 1967) (1967) with Ken Bulmer
- Letter (The Alien Critic #5) (1973)
- Letter (The Alien Critic #5) (1973) with H. K. Bulmer
- Letter (The Patchin Review Number Three) (1982)
- Letter (The Patchin Review Number Three) (1982) with Dray Prescot
- Letter (Vector 70) (1975)
- Letter (Vector 70) (1975) with Ken Bulmer
- Letter: On Oafish & Otherwise (1973)
- Letter: On Oafish & Otherwise (1973) with Ken Bulmer
- Life at Last (1958) with John Newman
- Life at Last (1958) with Kenneth Johns
- Life on Mars? (1958) with John Newman
- Life on Mars? (1958) with Kenneth Johns
- Light and Darkness (1958) with John Newman
- Light and Darkness (1958) with Kenneth Johns
- Limitless Life (1960) with John Newman
- Limitless Life (1960) with Kenneth Johns
-
Livets uppkomst och utveckling på Jorden (Häpna! 1958:3)?Livets uppkomst och utveckling pa Jorden (Haepna! 1958:3)[Swedish] (1958) with John Newman
-
Livets uppkomst och utveckling på Jorden (Häpna! 1958:3)?Livets uppkomst och utveckling pa Jorden (Haepna! 1958:3)[Swedish] (1958) with Kenneth Johns
-
Livets uppkomst och utveckling på Jorden (Häpna! 1958:4)?Livets uppkomst och utveckling pa Jorden (Haepna! 1958:4)[Swedish] (1958) with John Newman
-
Livets uppkomst och utveckling på Jorden (Häpna! 1958:4)?Livets uppkomst och utveckling pa Jorden (Haepna! 1958:4)[Swedish] (1958) with Kenneth Johns
-
Livets uppkomst och utveckling på Jorden (Häpna! 1958:6)?Livets uppkomst och utveckling pa Jorden (Haepna! 1958:6)[Swedish] (1958) with John Newman
-
Livets uppkomst och utveckling på Jorden (Häpna! 1958:6)?Livets uppkomst och utveckling pa Jorden (Haepna! 1958:6)[Swedish] (1958) with Kenneth Johns
- Malt Loaf (1973)
- Mars - Fact and Fiction (1956) with Kenneth Johns
- Mars - Fact and Fiction (1956) with John Newman
- Masks of Scorpio (1984)
- Masks of Scorpio (1984) with Alan Burt Akers
- Mind Over Matter (1956) with John Newman
- Mind Over Matter (1956) with Kenneth Johns
- Miniature Mercury (1959) with John Newman
- Miniature Mercury (1959) with Kenneth Johns
- Moon Bright (1959) with John Newman
- Moon Bright (1959) with Kenneth Johns
- New Moon (1961) with John Newman
- New Moon (1961) with Kenneth Johns
- Next Call Alpha Centauri (1958) with John Newman
- Next Call Alpha Centauri (1958) with Kenneth Johns
- Nomads of the Sky (1957) with John Newman
- Nomads of the Sky (1957) with Kenneth Johns
- On the Jikaida Cycle (1979)
- On the Jikaida Cycle (1979) with Alan Burt Akers
- Our Invisible Shield (1955) with John Newman
- Our Invisible Shield (1955) with Kenneth Johns
- Our Invisible Shield - 2 (1955) with John Newman
- Our Invisible Shield - 2 (1955) with Kenneth Johns
- Outward Bound 6: Project Mercury (1959) with John Newman
- Outward Bound 6: Project Mercury (1959) with Kenneth Johns
- Outward Bound: 1. The First 100 Miles (1958) with John Newman
- Outward Bound: 1. The First 100 Miles (1958) with Kenneth Johns
- Outward Bound: 2. Space Medicine (1958) with John Newman
- Outward Bound: 2. Space Medicine (1958) with Kenneth Johns
- Outward Bound: 3. Shots at the Moon (1958) with John Newman
- Outward Bound: 3. Shots at the Moon (1958) with Kenneth Johns
- Outward Bound: 4. High-G (1959) with John Newman
- Outward Bound: 4. High-G (1959) with Kenneth Johns
- Outward Bound: 5. Behind the Scenes (1959) with John Newman
- Outward Bound: 5. Behind the Scenes (1959) with Kenneth Johns
- Outward Bound: 7. Planning for Tomorrow (1960) with John Newman
- Outward Bound: 7. Planning for Tomorrow (1960) with Kenneth Johns
- Outward Bound: 8. Sophisticated Satellites (1960) with John Newman
- Outward Bound: 8. Sophisticated Satellites (1960) with Kenneth Johns
- Power in the Sky (1957) with John Newman
- Power in the Sky (1957) with Kenneth Johns
- Progress of I.G.Y.: 1. The Earth Their Laboratory (1957) with Kenneth Johns
- Progress of I.G.Y.: 1. The Earth Their Laboratory (1957) with John Newman
- Progress of I.G.Y.: 2. Look to the Sky (1957) with John Newman
- Progress of I.G.Y.: 2. Look to the Sky (1957) with Kenneth Johns
- Project Air (1956) with John Newman
- Project Air (1956) with Kenneth Johns
- Project Vanguard (1956) with Kenneth Johns
- Project Vanguard (1956) with John Newman
- Quest for Tomorrow (1957) with John Newman
- Quest for Tomorrow (1957) with Kenneth Johns
- Quizzical Glass (1957) with John Newman
- Quizzical Glass (1957) with Kenneth Johns
- Radio Space (1961) with John Newman
- Radio Space (1961) with Kenneth Johns
- Research Nuclear Reactors (1955) with John Newman
- Research Nuclear Reactors (1955) with Kenneth Johns
- Reverie (2020)
- Reverie (2020) with Staggerer
- Reviews (Foundation #1) (1972)
- Reviews (Foundation #1) (1972) with Ken Bulmer
- Reviews (Foundation #2) (1972)
- Reviews (Foundation #2) (1972) with Ken Bulmer
- Reviews (Foundation #3) (1973)
- Reviews (Foundation #3) (1973) with Ken Bulmer
- Reviews (Foundation #4) (1973)
- Reviews (Foundation #4) (1973) with Ken Bulmer
- Rockoons, Drainpipes and Jatos (1957) with John Newman
- Rockoons, Drainpipes and Jatos (1957) with Kenneth Johns
- Space Bullets (1961) with John Newman
- Space Bullets (1961) with Kenneth Johns
- Space for Madness (1959) with John Newman
- Space for Madness (1959) with Kenneth Johns
- Space Rescue (1961) with John Newman
- Space Rescue (1961) with Kenneth Johns
- Space Today (1960) with John Newman
- Space Today (1960) with Kenneth Johns
- Special Feature: Discussion Panel of SF Writers (1972) with Mark Adlard and James Blish and John Brunner and David Gerrold and Anne McCaffrey and Christopher Priest
- Special Feature: Discussion Panel of SF Writers (1972) with Mark Adlard and James Blish and John Brunner and Ken Bulmer and David Gerrold and Anne McCaffrey and Christopher Priest
- Stardust Patrol (1958) with John Newman
- Stardust Patrol (1958) with Kenneth Johns
- Station Sol (1958) with John Newman
- Station Sol (1958) with Kenneth Johns
- Superstitious? (1943)
- Superstitious? (1943) with H. Ken Bulmer
- TAFF Tales (excerpt) (2019)
- TAFF Tales (excerpt) (2019) with Ken Bulmer
- Techniques et artefacts (introduction) [French] (1979) with Ken Bulmer
- Technologie en apparaten (Introduction) [Dutch] (1979)
- Technologies and Artefacts (introduction) (1977)
- Technologies and Artefacts (introduction) (1977) with Ken Bulmer
- Tell-Tail (1960) with John Newman
- Tell-Tail (1960) with Kenneth Johns
- That Moon Plaque (Men on the Moon) (1969)
- The Ages of Ice (1959) with John Newman
- The Ages of Ice (1959) with Kenneth Johns
- The Barred Spiral Enigma (1959) with John Newman
- The Barred Spiral Enigma (1959) with Kenneth Johns
- The Belts of Van Allen (1960) with John Newman
- The Belts of Van Allen (1960) with Kenneth Johns
- The Challenge of the Sea (1958) with John Newman
- The Challenge of the Sea (1958) with Kenneth Johns
- The Clue of the Coelacanth (1956) with Kenneth Johns
- The Clue of the Coelacanth (1956) with John Newman
- The Conquest of Space: Readers' views (1940) with John Burke and Arthur C. Clarke and Osmond Robb and Harry Turner
- The Conquest of Space: Readers' views (1940) with Henry K. Bulmer and John F. Burke and Arthur C. Clarke and Osmond Robb and Harry E. Turner (I)
- The Crater Controversy (1958) with John Newman
- The Crater Controversy (1958) with Kenneth Johns
- The Deeps (1960) with John Newman
- The Deeps (1960) with Kenneth Johns
- The Evolution of Man - Part 1. The Scene Is Set (1956) with John Newman
- The Evolution of Man - Part 1. The Scene Is Set (1956) with Kenneth Johns
- The Evolution of Man - Part 2 - The Drama Begins (1956) with John Newman
- The Evolution of Man - Part 2 - The Drama Begins (1956) with Kenneth Johns
- The Evolution of Man - Part 3 -The Actors Appear (1956) with John Newman
- The Evolution of Man - Part 3 -The Actors Appear (1956) with Kenneth Johns
- The Evolution of Man: 4. The Curtain Rises (1957) with John Newman
- The Evolution of Man: 4. The Curtain Rises (1957) with Kenneth Johns
- The Evolution of Man: 5. The Heralds of Man (1957) with John Newman
- The Evolution of Man: 5. The Heralds of Man (1957) with Kenneth Johns
- The Evolution of Man: 6—Not Man, Not Ape (1957) with John Newman
- The Evolution of Man: 6—Not Man, Not Ape (1957) with Kenneth Johns
-
The Evolution of Man: Part 7—Prelude to Man?The Evolution of Man: Part 7-Prelude to Man(1957) with John Newman
-
The Evolution of Man: Part 7—Prelude to Man?The Evolution of Man: Part 7-Prelude to Man(1957) with Kenneth Johns
-
The Evolution of Man: Part Eight: Conclusion—Man Alone?The Evolution of Man: Part Eight: Conclusion-Man Alone(1957) with John Newman
-
The Evolution of Man: Part Eight: Conclusion—Man Alone?The Evolution of Man: Part Eight: Conclusion-Man Alone(1957) with Kenneth Johns
- The First Decade (1960) with John Newman
- The First Decade (1960) with Kenneth Johns
- The Great Nebula (1958) with John Newman
- The Great Nebula (1958) with Kenneth Johns
- The International Geophysical Year (1956) with Kenneth Johns
- The International Geophysical Year (1956) with John Newman
- The Little Neutral (1956) with John Newman
- The Little Neutral (1956) with Kenneth Johns
- The Meson Story (1959) with John Newman
- The Meson Story (1959) with Kenneth Johns
- The Modern Mars (1957) with John Newman
- The Modern Mars (1957) with Kenneth Johns
- The Mohole (1959) with John Newman
- The Mohole (1959) with Kenneth Johns
- The Nuclear Navy (Part 1 of 2) (1957) with Kenneth Johns
- The Nuclear Navy (Part 1 of 2) (1957) with John Newman
- The Nuclear Navy (Part 2 of 2) (1957) with John Newman
- The Nuclear Navy (Part 2 of 2) (1957) with Kenneth Johns
- The Origin of the Solar System (1956) with John Newman
- The Origin of the Solar System (1956) with Kenneth Johns
- The Problems of Genesis (1979)
- The Problems of Genesis (1979) with Ken Bulmer
- The Ringed Wonder (1957) with John Newman
- The Ringed Wonder (1957) with Kenneth Johns
- The Solar Atmosphere (1957) with Kenneth Johns
- The Solar Atmosphere (1957) with John Newman
- The Solar Bomb (1958) with John Newman
- The Solar Bomb (1958) with Kenneth Johns
- The Spikatur Cycle (2010)
- The Spikatur Cycle (2010) with Alan Burt Akers
- The Sunspot Cycle (1958) with John Newman
- The Sunspot Cycle (1958) with Kenneth Johns
- The Unknown Universe (1957) with John Newman
- The Unknown Universe (1957) with Kenneth Johns
- The Vertical Approach (1956) with Kenneth Johns
- The Vertical Approach (1956) with John Newman
- The Vertical Frontier (1961) with John Newman
- The Vertical Frontier (1961) with Kenneth Johns
- Time and Dr. Mossbauer (1960) with John Newman
- Time and Dr. Mossbauer (1960) with Kenneth Johns
- Time Binding Moebius Strip (1966)
- Time Binding Moebius Strip (1966) with H. Ken Bulmer
- Time For Moderns (1959) with John Newman
- Time For Moderns (1959) with Kenneth Johns
- Tools for Tomorrow (1955) with John Newman
- Tools for Tomorrow (1955) with Kenneth Johns
- Under the Suns of Scorpio ... (1983)
- Under the Suns of Scorpio ... (1983) with Alan Burt Akers
- Vintergator i miljoner [Swedish] (1957) with John Newman
- Vintergator i miljoner [Swedish] (1957) with Kenneth Johns
- Yorkshire Pudding (1973)
- Prescot's Map of Part of Kregen (1974)
- Prescot's Map of Part of Kregen (1974) with Dray Prescot
Non-Genre Titles
Novels
- A Flame in the Fens (1974)
- A Flame in the Fens (1974) with Arthur Frazier
- An Axe In Miklagard (1975)
- An Axe In Miklagard (1975) with Arthur Frazier
- Battle Smoke (1974)
- Battle Smoke (1974) with Adam Hardy
- Blood Beach (1975)
- Blood Beach (1975) with Adam Hardy
- Blood for Breakfast (1974)
- Blood for Breakfast (1974) with Adam Hardy
- Boarders Away (1975) with Adam Hardy
- Boarders Away! (1975)
- Boarders Away! (1975) with Adam Hardy
- By Pirate's Blood (1975)
- By Pirate's Blood (1975) with Richard Silver
- Close Quarters (1977)
- Close Quarters (1977) with Adam Hardy
- Court Martial (1974)
- Court Martial (1974) with Adam Hardy
- Cut and Thrust (1974)
- Cut and Thrust (1974) with Adam Hardy
- Das Duell [German] (1975) with Adam Hardy
- Das Prisenschiff [German] (1975) with Adam Hardy
- Der Brander [German] (1975) with Adam Hardy
- Der spanische Dreidecker [German] (1975) with Adam Hardy
- Die Beutefregatte [German] (1975) with Adam Hardy
- Fireship (1975)
- Fireship (1975) with Adam Hardy
- Jaws of Death (1975)
- Jaws of Death (1975) with Richard Silver
- Kriegsgericht [German] (1975) with Adam Hardy
- Landhaie und Teerjacken [German] (1975) with Adam Hardy
- Oath of Blood (1973)
- Oath of Blood (1973) with Arthur Frazier
- Powder Monkey (1973)
- Powder Monkey (1973) with Adam Hardy
- Press Gang (1973)
- Press Gang (1973) with Adam Hardy
- Prize Money (1973)
- Prize Money (1973) with Adam Hardy
- Sailor's Blood (1974) with Adam Hardy
- Savage Siege (1974) with Adam Hardy
- Sea Flame (1976)
- Sea Flame (1976) with Adam Hardy
- Sea of Gold (1974) with Adam Hardy
- Sea of Swords (1977)
- Sea of Swords (1977) with Andrew Quiller
-
Seiner Majestät Lieutenant?Seiner Majestaet Lieutenant[German] (1975) with Adam Hardy
- Shark Pack (1980)
- Streich die Flagge, Bastard! [German] (1975) with Adam Hardy
- The Dark Return (1975)
- The Dark Return (1975) with Neil Langholm
- The Fireship (1975) with Adam Hardy
- The King's Death (1973)
- The King's Death (1973) with Arthur Frazier
- The Land of Mist (1976) with Andrew Quiller
- The Land of the Mist (1976)
- The Press Gang (1973) with Adam Hardy
- The Siege (1973)
- The Siege (1973) with Adam Hardy
- Trail of Blood (1976)
- Trail of Blood (1976) with Neil Langholm
- Treasure (1973)
- Treasure (1973) with Adam Hardy
- Treasure Map (1974) with Adam Hardy
- Unter der Flagge des Admirals [German] (1975) with Adam Hardy
- Volle Breitseite [German] (1975) with Adam Hardy
- White-Out (1960)
- White-Out (1960) with Ernest Corley
- Fox Double (1973) [O/1,2]
- Fox Double (1973) [O] with Adam Hardy
- Fox Double No. 2 (1974) [O/3,4]
- Fox Double No. 2 (1974) [O] with Adam Hardy