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Nonfiction
- A Multitude of Visions (1975)
- Association News
- On Being the US Agent (1990)
- The Future in Books
- The Future in Books (Amazing Stories, March 1972) (1972) with Stephen Allen Whealton and Ted White
- The Future in Books (Amazing Stories, January 1973) (1973) with Thomas F. Monteleone
- The Future in Books (Amazing Stories, June 1973) (1973) with Thomas F. Monteleone and Alexei Panshin
- The Future in Books (Amazing Stories, August 1973) (1973) with Thomas F. Monteleone and Bill Noble, 3rd
- The Future in Books (Amazing Stories, December 1973) (1973) with Thomas F. Monteleone
- The Future in Books (Amazing Stories, February 1974) (1974) with Thomas F. Monteleone and Karl T. Pflock
- The Future in Books (Amazing Stories, April 1974) (1974) with Thomas F. Monteleone and Ted White
- The Future in Books (Amazing Stories, March 1975) (1975) with Thomas F. Monteleone
- The Future in Books (Amazing Stories, July 1975) (1975) with Grant Carrington and Thomas F. Monteleone
- Letter (Analog, April 1970) (1970)
- Letter (Amazing Stories, July 1970) (1970)
- For Ballard Fans (1971)
- Letter (Science Fiction Review, March 1971) (1971)
- Letter (Amazing, May 1971) (1971)
- Letter (Amazing Stories, November 1971) (1971)
- Letter (Amazing Stories, January 1972) (1972)
- Re TWJ #79 (1972)
- Letter (Amazing Stories, July 1972) (1972)
- Letter (SF Commentary 33) (1973)
- Letter (Riverside Quarterly, April 1973) (1973)
- The Death of Imagination (1973)
- Book Reviews (Moebius Trip Library: Science Fiction Echo 17) (1973) with Eddy C. Bertin and Ed Connor and Angus Taylor
- Letter (Moebius Trip Library: Science Fiction Echo 17) (1973)
- Letter (Algol 20, May 1973) (1973)
- Letter (Riverside Quarterly, August 1973) (1973)
- How Theodore Sturgeon Learned to Love Relevance and Ruined His Science Fiction (1973)
- Letter (Algol 21, November 1973) (1973)
- Letter (SF Commentary 40) (1974)
- Letter (The Diversifier #4) (1974)
- A Multitude of Visions (1975)
- Letter (SF Commentary 44/45) (1975)
- Letter (The Witch and the Chameleon #5-6) (1976)
- Letter: Do SF Readers Prefer Trash? (1976)
- Letter (Algol, #26, Summer 1976) (1976)
- Doris Lessing Briefing (1976)
- British SF: An American View (1977)
- Letter (Janus, Winter 1977) (1977)
- British and American SF: 'Waves' Apart? (1978)
- Bill Bowers: "I Need Friends ... Who Care." (1978)
-
Don't Forget I'm an Artifice (1978)
also appeared as:
- Variant: Don't Forget, I'm an Artifice (2015)
- Aspects of Ursula K. Le Guin (1980)
- Letter (On Fantasy and Reality and Joanna Russ) (1980)
- Letter (SF Commentary 60/61) (1980)
- Letter [2] (SF Commentary 60/61) (1980)
- Letter (Matrix 33) (1980)
- Can We Gain New Awareness by Denying Our Senses? (1981)
- Letter (Foundation #22) (1981)
- Letter (Vector 103) (1981)
- Letter (Vector 105) (1981)
- Ian Watson's Miracle Men (1982)
- Letter (Foundation #25) (1982)
- Cliche - The Freedom of Science Fiction (1983)
- Letter (Vector 113) (1983)
- Letter (Vector 114) (1983)
- Letter (Vector 116) (1983)
- A Transatlantic Literature, Hurrah! (1984)
- Letter (Vector 122) (1984)
- Letter: In reply to Franz Rottensteiner (1984)
- Letter (Matrix 67) (1986)
- Letter (Matrix 67) [2] (1986)
- Preface (The Tale That Wags the God) (1987)
- Letter (Vector 138) (1987)
- Letter (Vector 140) (1987)
- Letter (New Toy 2) (1988)
- Letter: On the Review that Wagged the Finger (1989)
- Letter (NYRSF, December 1989) (1989)
- Letter (SF Commentary 68) (1990)
- Letter (Vector 174) (1993)
- Terraforming (1998)
- Letter (Vector 205) (1999)
- Letter (Vector 213) (2000)
- Letter (SF Commentary 77) (2001)
- Letter (Vector 221) (2002)
- Letter (Vector 238) (2004)
- Letter (Vector 243) (2005)
- Letter (SF Commentary 80) (2010)
- Letter (SF Commentary 81) (2011)
- Letter (SF Commentary 87) (2014)
- Letter (SF Commentary 88) (2015)
- Letter (SF Commentary 90) (2015)
- Letter (Portable Storage, Two) (2019)
- Letter (Portable Storage 3) (2020)
- Letter (Portable Storage 4) (2020)
- Letter (Analog, January-February 2021) (2021)
- Hooked! (2021)
- Letter (Portable Storage 5) (2021)
- Letter (Analog, September-October) (2021)
- Advent Publishers, Inc. (2021)
- Letter (Portable Storage 6) (2021)
- From a Corner Table at Rough House's (Riverside Quarterly, July 1971) (1971)
- From a Corner Table at Rough House's (Riverside Quarterly, July 1971) [2] (1971)
- From a Corner Table at Rough House's (Riverside Quarterly, July 1971) [3] (1971)
- Opere Citato (Riverside Quarterly, February 1972) (1972)
- Riverside Quarterly, February 1972 (1972)
- The Seasonal Fan (Riverside Quarterly, February 1972) (1972)
- The Seasonal Fan (Riverside Quarterly, February 1972) [2] (1972)
- What It's Not All About (1972)
- What It's Not All About [2] (1972)
- Books Received (but not appreciated) (1973)
- Opere Citato (Riverside Quarterly, April 1973) (1973)
- Riverside Quarterly, April 1973 (1973)
- The Seasonal Fan (Riverside Quarterly, August 1973) (1973)
- Antique Axemanship: Hardboiled Cliché (1974)
- Antique Axemanship: Hardboiled Cliché [2] (1974)
- Speaking Worlds to Each Other (1975)
- Future Lumber or Aboreal Genocide Today (1977)
- Chronocules (1972) by D. G. Compton
- Five Fates (1972) by Keith Laumer and Poul Anderson and Harlan Ellison and Frank Herbert and Gordon R. Dickson
- Moderan (1973) by David R. Bunch
- SF: The Other Side of Realism (1973) by Thomas D. Clareson
- New Worlds Quarterly 4 (1973) by Michael Moorcock
- Daughters of Earth (1973) by Judith Merril
- Stardreamer (1973) by Cordwainer Smith
- The Day the Sun Stood Still (1973) by Robert Silverberg
- From Utopia to Nightmare (1973) by Chad Walsh
- Pilgrims Through Space and Time (1973) by J. O. Bailey
- The Gods Themselves (1973) by Isaac Asimov
- Clarion II (1973) by Robin Scott Wilson
- Generation (1973) by David Gerrold
- The Sheep Look Up (1973) by John Brunner
- When Harlie Was One (1974) by David Gerrold
- Billion Year Spree (1974) by Brian Aldiss
- H. G. Wells: Critic of Progress (1974) by Jack Williamson
- The Man Who Folded Himself (1974) by David Gerrold
- Three Trips in Time and Space (1974) by Larry Niven and John Brunner and Jack Vance
- Orbit 11 (1975) by Damon Knight
- The Best Science Fiction of the Year #2 (1975) by Terry Carr
- The Guns of Avalon (1975) by Roger Zelazny
- The Science Fiction Hall of Fame, Volume 2A (1975) by Ben Bova
- The Science Fiction Hall of Fame, Volume 2B (1975) by Ben Bova
- The Inverted World (1975) by Christopher Priest
-
Strange Relations (1975)
by
Philip José Farmer?Philip Jose Farmer
- The Reproductive System (1975) by John T. Sladek
- Flow My Tears, the Policeman Said (1975) by Philip K. Dick
- Imaginary Worlds (1975) by Lin Carter
- The Farthest Shore (1975) by Ursula K. Le Guin
- The Iron Dream (1975) by Norman Spinrad
- New Worlds No. 6 (1975) by Charles Platt and Hilary Bailey
- No Blade of Grass (1975) by John Christopher
- The Winds of Time (1975) by Chad Oliver
- The Chalk Giants (1975) by Keith Roberts
- The Invincible (1975) by Stanislaw Lem
- Fire Time (1975) by Poul Anderson
- The World of Fanzines: A Special Form of Communication (1975) by Fredric Wertham
- Total Eclipse (1975) by John Brunner
- A Mirror for Observers (1975) by Edgar Pangborn
- And Chaos Died (1976) by Joanna Russ
- Behold the Man (1976) by Michael Moorcock
- Where Late the Sweet Birds Sang (1976) by Kate Wilhelm
- Earth Abides (1977) by George R. Stewart
- The Memoirs of a Survivor (1977) by Doris Lessing
- Interfaces (1981) by Ursula K. Le Guin and Virginia Kidd
- Miracle Visitors (1981) by Ian Watson
- Transmutations: A Book of Personal Alchemy (1983) by Alexei Panshin
- SF Commentary Reprint Edition: First Year 1969 (1983) by Bruce Gillespie
- Lavondyss (1990) by Robert Holdstock
- The Cipher (1991) by Kathe Koja