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Novels
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The Mystery of the Dragon's Shadow (1936)
also appeared as:
- Serializations:
- The Mystery of the Dragon's Shadow (Complete Novel) (1936)
-
The Mystery of the Golden Skull (1936)
also appeared as:
- Serializations:
- The Mystery of the Golden Skull (Complete Novel) (1936)
-
The Mystery of the Singing Mummies (1936)
only appeared as:
- Serializations:
- The Mystery of the Singing Mummies (Complete Novel) (1936)
- Strange War (2011)
- Strange Enemies (2012)
- Strange Operators (2014)
- Strange Staffels (2015)
- Strange Spectres (2016)
- Strange Hell (2017)
- Strange Squadrons (2018)
- Strange Deaths (2019)
- Strange Rivals (2021)
-
The Flying Saucers Are Real (1950)
only appeared as:
- Variant: The Flying Saucers Are Real (1950) [as by Donald Keyhoe]
- Translation: I dischi volanti sono una realtà [Italian] (2017)
-
Flying Saucers from Outer Space (1953)
also appeared as:
- Translation: La verità sui dischi volanti [Italian] (1954)
- Translation: Dischi volanti dallo spazio profondo [Italian] (2018)
- The Flying Saucer Conspiracy (1955)
- Flying Saucers: Top Secret (1960)
- Aliens from Space: The Real Story of Unidentified Flying Objects (1973)
- The Grim Passenger (1925) [also as by Donald Edward Keyhoe]
- The Mystery Under the Sea (1926) [also as by Donald Edward Keyhoe]
- Through the Vortex (1926)
- The Master of Doom (1927) [only as by Donald Edward Keyhoe]
- A Squadron Will Perish (1931)
- Cocardes of Courage (1931)
- The Drome of Dread (1931)
- Spectre of the Red Knight (1932)
- The Code of K-14 (1932)
- Port of Missing Pilots (1932)
- Hell's Gateway (1932)
- The Fokker Fiend (1932)
- The Devil's Holocaust (1932)
- The Red Demon (1932)
- The Brain-Devil of G-2 (1932)
- Scourge of the Skies (1932)
- The Vanishing Staffel (1932)
- Vengeance of V-99 (1933)
- The Unholy Horror (1933)
- The Masked Marauders (1933)
- The Sky Torch (1933)
- Tombstone Tarmac (1933)
- Marauders Without Mercy (1933)
- Hoodoo Drome (1933)
- The Ace of a Thousand Faces (1933)
- The Brain Devil's Double (1934)
- The Vanishing Avenger (1934)
- Satan's Staffel (1934)
- The Ghost from G-2 (1934)
- The Midnight Ace (1934)
- Menace of the Unmasked (1934)
- Legion of the Lost (1934)
- Dealers in Death (1934)
- Devil's Bait (1934)
- The Gallows Ghost (1934)
- The Skull Staffel (1934)
- Raid of the Red Reaper (1935)
- Satan's Shroud (1935)
- The Bridge of Death (1935)
- Valley of Vengeance (1935)
- The Traitor Three (1935)
- Scourge of the Spectre (1935)
- Squadron of Masked Men (1935)
- Weird Wireless (1935)
- Devil of the Yellow Doom (1935)
- Strafe of the Flying Corpse (1936)
- Dromes of Hades (1936)
- The Armored Corpse (1936)
- The Skeleton Barrage (1936)
- Staffel of the Starved (1936)
- Squadron from the Grave (1936)
- Drome of the Bat Staffel (1936)
- Hellions of Headless Death (1936)
- Bubbles of Doom (1936)
- Stolen—A Squadron (1937)
- Dead Man's Drome (1937)
- Fokkers of the Red Fog (1937)
- The Mad Squadron (1937)
- Skeleton from the Sky (1937)
- The Headsman Strafe (1938)
- Scourge of Oblivion (1938)
- Pirate Squadron (1938)
- The Gray-Face Ace (1938)
- Strafe of the Skull (1938)
- Raid of the Wraith (1939)
- The Staffel Invisible (1939)
- Flight of the Phantoms (1939)
- When England Vanished (1939)