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Serials
- Tarunguro (Part 2 of 3) (1938)
- Fantasy Times - 1944 (1944)
- Fantasy Times - 1945 (1945)
- Fantasy Times - 1946 (1946)
- Fantasy-Times - 1941 (1941)
- Weird Tales - 1973 (1973)
- Weird Tales - 1974 (1974)
- A Man Called Poe: Stories in the Vein of Edgar Allan Poe (1972)
- A Sense of Wonder (1967)
- Alien Earth and Other Stories (1969) with Roger Elwood
- Award Science Fiction Reader (1966) with Alden H. Norton
- Award Science Fiction Reader (1966) with Alden H. Norton
- Chefs-d'œuvre de la science-fiction [French] (1967)
- Der Robotspion [German] (1969) with Roger Elwood
- Die Gesichter der Zukunft [German] (1973)
-
Die imaginäre Größe?Die imaginaere Groesse[German] (1978) with Roger Elwood
- Doorway Into Time (1966)
- Editor's Choice in Science Fiction (1954)
- Exploring Other Worlds (1963)
- Futures to Infinity (1970)
- Ghostly by Gaslight (1971) with Alden H. Norton
- Great Untold Stories of Fantasy and Horror (1969) with Alden H. Norton
- Het menselijk nulpunt en andere verhalen [Dutch] (1975) with Roger Elwood
- Horrors in Hiding (1973) with Alden H. Norton
- Horrors Unknown (1971)
- Horrors Unseen (1974)
- L'âge d'or de la science-fiction: 3ème série [French] (1971) with Alden H. Norton
- L'âge d'or de la science-fiction: 4ème série [French] (1973)
- Masterpieces of Science Fiction (1967)
- Microcosmic God and Other Stories from Modern Masterpieces of Science Fiction (1968)
- Modern Masterpieces of Science Fiction (1965)
- O Futuro do Infinito [Portuguese] (1972)
- Os mágicos do espaço [Portuguese] (1972) with Alden H. Norton
- Other Worlds, Other Times (1969) with Roger Elwood
- Science Fiction by Gaslight (1968)
- Science-Fiction-Stories 42 [German] (1974) with uncredited
- Strange Signposts (1966) with Roger Elwood
- Terra Incognita [Italian] (1976) with Roger Elwood
- The Coming of the Robots (1963)
- The Human Zero and Other Science-Fiction Masterpieces (1967) with Roger Elwood
- The Man Who Called Himself Poe (1969)
- The Microcosmic God (1975) with Sam Moscowitz
- The Moon Era (1969)
- The Space Magicians (1971) with Alden H. Norton
- The Time Curve (1968) with Roger Elwood
- The Vortex Blasters (1968)
- Three Stories (1967)
- Under the Moons of Mars: A History and Anthology of 'The Scientific Romance' in the Munsey Magazines, 1912-1920 (1970)
- When Women Rule (1972)
- Zero umano [Italian] (1974) with Roger Elwood
- The Way Back (2021)
- World of Mockery (2020)
- A Canticle for P. Schuyler Miller (1975)
- A. Merritt: Reflections in the Moon Pool (1985) with A. Merritt
- After All These Years ... (1991)
- After Ten Years: A Tribute to Stanley G. Weinbaum 1902–1935 (1945) with Gerry de la Ree
- Charles Fort: A Radical Corpuscle (1976)
- Explorers of the Infinite: Shapers of Science Fiction (1963)
- History of the Movement, from 1854 to 1890 (1980)
- Howard Phillips Lovecraft and Nils Helmer Frome: A Recollection of One of Canada's Earliest Science Fiction Fans (1989)
- Hugo Gernsback: Father of Science Fiction (1959)
- Peace and Olaf Stapledon: An Editorialized Report (1950)
- Science Fiction Calendar 1976 (1975)
- Seekers of Tomorrow (1966)
- Strange Horizons: The Spectrum of Science Fiction (1976)
- The Immortal Storm: A History of Science Fiction Fandom (1951)
- De weg terug [Dutch] (1986)
- Death of a Dinosaur (1956)
- Der Weg zurück [German] (1990)
- Le chemin du retour [French] (1973)
- Mad World (1938)
- Man of the Stars (1941)
- No More Falsto (1937)
- O Regresso [Portuguese] (1972)
- Sitting Duck (1956)
- Still Water (1940)
- Tarunguro (1938)
- The Curse of Immortality (1938)
- The Golden Pyramid (1956)
- The Lost Chord (1953)
- The Way Back (1941)
- World of Mockery (1941)
- The Immortal (1937)
- The Immortal (1937) with Robert Sanders Shaw
- The Search (1938)
- The Search (1938) with Robert Sanders Shaw
- "I, Robot": Introduction (1961)
- "I, Robot": Introduction (1961) with uncredited
- "Psycho"-logical Bloch (1962)
- 'Policy' Is Losing Readers (1947)
- (foreword to Death of a Sensitive) (1954)
- (Introduction to Body and Soul) (1971)
- (Introduction to From Hand to Mouth) (1971)
- (Introduction to Grettir at Thorhall-Stead) (1971)
- (Introduction to The Challenge from Beyond) (1971)
- (Introduction to The Devil of the Picuris) (1971)
- (Introduction to The Flying Lion) (1971)
- (Introduction to The Pendulum and Pendulum) (1971)
- (Introduction to The Pool of the Stone God) (1971)
- (Introduction to Unseen—Unfeared) (1971)
- (Introduction to Werewoman) (1971)
- (Response to Charles Elkins) (1987)
- 1939—Nycon: Fandom Before Glasnost (1989)
- 1951—Nolacon I, New Orleans: Nolacon I: A Torrid Affair (1989)
- 1954—SFCon, San Francisco: San Francisco: Convention Politics (1989)
- 1955—Clevention, Cleveland: Mystery Guest of Honor (1989)
- 1958—Solacon, South Gate: Stranger Than Fiction (1989)
- 1959—Detention, Detroit: The Play Is Ended But No Memory Lingers on (1989)
- 1960—Pittcon, Pittsburgh: A Hugo for Hugo (1989)
- 1961—Seacon, Seattle: Heinlein as Host (1989)
- 1964—Pacificon II, Oakland: What to Do About Undesirables (1989)
- A Basic Science-Fiction Library (1949) with Forrest J. Ackerman and Everett F. Bleiler and David H. Keller, M.D. and Henry Kuttner and Sam Merwin, Jr. and P. Schuyler Miller and C. L. Moore and Paul L. Payne and A. Langley Searles and Theodore Sturgeon and A. E. van Vogt and Donald Wandrei
- A Basic Science-Fiction Library (1949) with Forrest J. Ackerman and Everett Bleiler and David H. Keller and Sam Merwin, Jr. and P. Schuyler Miller and Lewis Padgett and Paul L. Payne and A. Langley Searles and Theodore Sturgeon and A. E. van Vogt and Donald Wandrei
- A History of "The Scientific Romance" in the Munsey Magazines, 1912-1920 (1970)
- A Landmark Pulp Magazine Bibliography (1990)
- A Portfolio of Early Space Ships 1638-1929 (1956)
- A Quintessential Reference (1979)
- A Record of A Business Friendship (1981)
- A Study in Horror: The Eerie Life of H. P. Lovecraft (1960)
- A. E. van Vogt [Italian] (1973)
- Abraham Merritt ou le Merveilleux [French] (1971)
- Afterword to "Who Goes There?" (1988)
- Alonzo Deen Cole and The Witch's Tales Magazine (1993)
- Amazing Encounter: MacFadden's Takeover of Gernsback's Company (1986)
- Amazing Encounter: Part II (1986)
- Anatomy of a Collection: The Sam Moskowitz Collection (1983)
- Anti-Semitism: The Day of the Messiah (1976)
- Are We Advocates of Scientific Fiction? (1937)
- Armageddon - 2419 A.D.: Introduction (1961)
- Armageddon - 2419 A.D.: Introduction (1961) with uncredited
- Around the Worlds With Jules Verne (1958)
- Art: Portraitist of Prescience (1976)
- Arthur C. Clarke (1963)
- Arthur Conan Doyle - A Study in Science Fiction (1959)
- Asimov at Philcon: "My Seven Steps to Celebrity" (1986)
- Atlanta's Worldcon: Bradbury Flying High! (1986)
- Barsoom (and Amtor) Pre Visited (1968)
- Birth Control: Better the World Below Than the World Above (1976)
- Book Reviews (Science-Fiction Plus, April 1953) (1953)
- Book Reviews (Science-Fiction Plus, August 1953) (1953)
- Book Reviews (Science-Fiction Plus, December 1953) (1953)
- Book Reviews (Science-Fiction Plus, June 1953) (1953)
- Book Reviews (Science-Fiction Plus, March 1953) (1953)
- Book Reviews (Science-Fiction Plus, May 1953) (1953)
- Book Reviews (Science-Fiction Plus, October 1953) (1953)
- By the Waters of Lethe or the Forgotten Man of Science-fiction (1945)
- C. L. Moore: Catherine the Great (1962)
- Can You Remember (1939)
- Celia Keller (1970)
- Chain Reaction (Science-Fiction Plus, August 1953) (1953)
- Chain Reaction (Science-Fiction Plus, December 1953) (1953)
- Chain Reaction (Science-Fiction Plus, October 1953) (1953)
- Civil Rights: Rockets to Green Pastures (1976)
- Clarification for Campbell (1940)
- Collecting: A Form of Residual Research (1994)
- Colorful Science Fiction Worlds of Alden H. Norton (1966)
- Comparisons Are Odious (1941)
- Crime: From Sherlock to Spaceships (1976)
- Cyrano DeBergerac - Swordsman of Space (1959)
- Das Wunder Weinbaum (Mars-Odyssee) [German] (1970)
- David H. Keller: In Retrospect (1953)
- Dawn of Fame: The Career of Stanley G. Weinbaum (1959)
- Death of an Artist: John Giunta—A Personalized Obituary (1971)
- Derleth's Lament to Love (1994)
- Devolution: Introduction (1961)
- Devolution: Introduction (1961) with uncredited
- Did Science Fiction Predict Atomic Energy? (1952) with Robert A. Madle
- E. E. 'Doc' Smith e il senso del meraviglioso [Italian] (1991)
- Edgar Rice Burroughs [Italian] (1973)
- Edmond Hamilton (1963)
- Edward E. «doc» Smith [Italian] (1981)
- Eric Frank Russell (Symbiotica e altre storie) [Italian] (2001)
- Eric Frank Russell: Death of a Doubter (1963)
- Euthanasia Limited: Introduction (1962)
- Fantasy and Science Fiction by Theodore Sturgeon (Bibliography) (1962)
- Fantasy Book Review (Fantastic Novels Magazine, May 1950) (1950) with A. Langley Searles
- Fantasy Book Reviews (Fantastic Novels Magazine, January 1949) (1949)
- Fantasy Book Reviews (Fantastic Novels Magazine, July 1949) (1949)
- Fantasy Book Reviews (Fantastic Novels Magazine, July 1950) (1950)
- Fantasy May Come and Fantasy May Go (excerpt) (1945)
- Felix Marti-Ibanez, M.D. (obituary) (1973)
- Fifty Years Young (1973)
- Five Steps to Science Fiction Sanity (1986)
- Foreword to "Song in a Minor Key" (1989)
- Frank Gruber (1970)
- Frank R. Paul Remembered (2009)
- Fritz Leiber [Italian] (1975)
- Fritz Leiber: Destiny x 3 (1963)
- From Fanzines to Fame: SF Figures Who Began as Fan Editors (1989)
- From the Beginning: Introduction (1964)
- Future Fandom (1940)
- George Griffith – The Warrior of If (1974)
- Gerry de la Ree (1993)
- Gerry de la Ree: An Obituary & Appreciation (1993)
- Ghosts of Prophecies Past, or, Frank Reade, Jr. and "Forgotten Chapters in American History" (1963)
- Guest Editorial (New Worlds Science Fiction, #99 October 1960) (1960)
- Gustavus W. Pope: Creator of the "The Scientific Romance" (1974)
- He That Hath Wings: Introduction (1963)
- He Was the Legend, Too! (1974)
- Henry Kuttner [Italian] (1972)
- Heritage: Introduction (1962)
- How Good an Editor Would a Fan Make? (1941)
- How Science Fiction Got Its Name (1956)
- Hugo Gernsback: "Father of Science Fiction" (1963)
- Hugo Gernsback: Father of Science Fiction (1959)
- I Remember Derleth (1981)
- I, Rocket: Introduction (1961)
- I, Rocket: Introduction (1961) with uncredited
- In Memoriam: John W. Campbell: The Writing Years (1971)
- In the Beginning ... (1973)
- Inside Madle—A Fan for All Seasons (1977)
- Introduction (A Man Called Poe) (1972)
- Introduction (A Radical Corpuscle) (1976)
- Introduction (A Round Trip to the Year 2000) (1974)
- Introduction (A Sense of Wonder) (1967)
- Introduction (A Trip to Venus) (1976)
- Introduction (Across the Zodiac: The Story of a Wrecked Record) (1974)
- Introduction (Caxton's Book) (1974)
- Introduction (City of Endless Night) (1974)
- Introduction (Cristal qui songe / Les plus qu'humains) [French] (1969)
- Introduction (Demain les chiens / Le pêcheur) [French] (1966)
- Introduction (Doorway Into Time) (1966)
- Introduction (Editor's Choice in Science Fiction) (1954)
- Introduction (Euthanasia Limited) (1962)
- Introduction (Explorers of the Infinite) (1963)
- Introduction (Exploring Other Worlds) (1963)
- Introduction (Fantasy Commentator, Spring 2011) (2011)
- Introduction (Far Future Calling) (1979)
- Introduction (Fondation / Fondation et empire / Seconde fondation) [French] (1965)
- Introduction (Ghostly By Gaslight) (1971)
- Introduction (Great Untold Stories of Fantasy and Horror) (1969)
- Introduction (Hauntings and Horrors) (1969)
- Introduction (Histoire du Futur: Tome 1) [French] (1967)
- Introduction (Horrors in Hiding) (1973) with Alden H. Norton
- Introduction (Horrors Unknown) (1971)
- Introduction (Horrors Unseen) (1974)
- Introduction (Into the Sun & Other Stories) (1980)
- Introduction (La nuit du jugement / La dernière aube) [French] (1966)
- Introduction (Le silence de la Terre / Voyage à Vénus / Cette hideuse puissance) [French] (1967)
- Introduction (Les amants étrangers / L'univers à l'envers) [French] (1968)
- Introduction (Les armureries d'Isher / Les fabricants d'armes) [French] (1965)
- Introduction (Les rois des étoiles / Retour aux étoiles) [French] (1968)
- Introduction (Life Everlasting and Other Tales of Science, Fantasy and Horror) (1947)
- Introduction (Masterpieces of Science Fiction) (1967)
- Introduction (Masters of Horror) (1968)
- Introduction (Minions of the Moon) (2017)
- Introduction (Modern Masterpieces of Science Fiction) (1965)
- Introduction (Olga Romanoff) (1974)
- Introduction (Omega, the Man) (1963)
- Introduction (Strange Horizons) (1976)
- Introduction (The Angel of the Revolution) (1974)
- Introduction (The Coming of the Ice) (1961)
- Introduction (The Coming of the Robots) (1963)
- Introduction (The Iron Star) (1976)
- Introduction (The Jewels of Vishnu) (1968)
- Introduction (The Lost Machine) (1960)
- Introduction (The Man Who Called Himself Poe) (1969)
- Introduction (The Metal Monster) (1974)
- Introduction (The Night Land) (1976)
- Introduction (The Space Magicians) (1971) with Alden H. Norton
- Introduction (The Spell of the Sword) (1967)
- Introduction (William Hope Hodgson: Masters of the Weird Tale) (2008)
- Introduction: A History of Science Fiction in the Popular Magazines, 1891-1911 (1968)
- Introduction: A Timely Escape (1992)
- Introduction: Bullion (1992)
- Introduction: Carnacki, the Ghost Finder (1992)
- Introduction: Date 1965: Modern Warfare (1992)
- Introduction: Master of the Octopus (1967)
- Introduction: Old Golly (1992)
- Introduction: The Doom of London (1967)
- Introduction: The Ghosts of the "Glen Doon" (1992)
- Introduction: The Goddess of Death (1992)
- Introduction: The Haunted "Pampero" (1992)
- Introduction: The Silent Ship (1992)
- Introduction: The Ultimate Hugo Gernsback (1975)
- Introduction: The Valley of Lost Children (1992)
- Introduction: The Wild Man of the Sea (1992)
- Introduzione. L'alba della fama. La carriera di Stanley G. Weinbaum [Italian] (2001)
- Isaac Asimov [Italian] (1975)
- Isaac Asimov's "Foundation" (1963)
- Isaac Asimov: Genius in the Candy Store (1962)
- Jack Williamson [Italian] (1974)
- Jack Williamson [Italian] (1991)
- Jack Williamson: Four-Way Pioneer (1964)
- James V. Taurasi (1991)
- James Vincent Taurasi, Sr. (1991)
- John Buchan: A Possible Influence on Lovecraft (1984)
- John Carter and the Giant of Mars: Introduction (1961)
- John Carter and the Giant of Mars: Introduction (1961) with uncredited
- John W. Campbell: A Personalized Obituary (1971)
- John W. Campbell: The Writing Years (1963)
- John W. Campbell: Transition from Author to Editor (2011)
- John Wyndham (1964)
- John Wyndham [Italian] (1976)
- Karel Capek (1961)
- Karel Capek: The Man Who Invented Robots (1960)
-
Karel Čapek: The Man Who Invented Robots?Karel Capek: The Man Who Invented Robots(1963)
- Kline vs. Burroughs: Discussions (1972) with Frank Belknap Long and Darrell C. Richardson
- L. Jerome Stanton (1993) with Andrew Porter
- L. Sprague De Camp [Italian] (1972)
- L. Sprague de Camp: Sword and Satire (1964)
- Lester del Rey (1963)
- Let 'Em Eat Space: Introduction (1963)
- Letter (Amazing Stories, February 1938) (1938)
- Letter (Amazing Stories, January 1939): The Science Fiction Convention (1939)
- Letter (Amazing Stories, May 1971) (1971)
- Letter (Amazing Stories, October 1977) (1977)
- Letter (Analog, April 1964) (1964)
- Letter (Analog, March 1985) (1985)
- Letter (Analog, May 1978) (1978)
- Letter (Asimov's, May 1980) (1980)
- Letter (Comet, December 1940) (1940)
- Letter (Emperor of Dreams: A Clark Ashton Smith Bibliography) (1978)
- Letter (F&SF, March 1980) (1980)
- Letter (Famous Fantastic Mysteries, February 1948): Moskowitz Answers Derleth (1948)
- Letter (Famous Fantastic Mysteries, January 1951): Mr. Moskowitz Explains (1951)
- Letter (Fantastic Story Magazine, Spring 1952) (1952)
- Letter (Fantasy Review, May 1986) (1986)
- Letter (Fantasy Review, May 1986) (1986) with Sam Moscowitz
- Letter (Locus #280) (1984)
- Letter (Locus #327) (1988)
- Letter (Locus #385) (1993)
- Letter (Locus #393) (1993)
- Letter (No Complaint) (1939)
- Letter (No More Classics) (1941)
- Letter (NYRSF, November 1989) (1989)
- Letter (NYRSF, October 1988) (1988)
- Letter (OAK Leaves, V1n10) (1972)
- Letter (Planet Stories, Fall 1942) Hi Yo, Moskowitz, Away! (1942)
- Letter (Quandry, November 1951) (1951)
- Letter (Riverside Quarterly, June 1970) (1970)
- Letter (Riverside Quarterly, March 1967) (1967)
- Letter (Science Fiction Review #30) (1979)
- Letter (Science Fiction Review #31) (1979)
- Letter (Science Fiction Review, February 1970) (1970)
- Letter (SF Commentary 14) (1970)
- Letter (SF Commentary 5) (1969)
- Letter (SF Commentary 58) (1980)
- Letter (SF Commentary, 35/36/37) (1973)
- Letter (Spaceways, February 1939) (1939)
- Letter (Spaceways, October 1939) (1939)
- Letter (Speculation 21) (1969)
- Letter (Tekeli-li!, Winter/Spring 1992) (1992)
- Letter (The Alchemist, Summer 1940) (1940)
- Letter (Thrilling Wonder Stories, February 1939): Five Star Issue (1939)
- Letter (Weird Tales #1) (1980)
- Letter (Weird Tales, April 1939): A Jumbo Edition (1939)
- Letter (Weird Tales, August 1939): Into Vigerous Maturity (1939)
- Letter (Zenith Speculation, July 1966) (1966)
- Letter: Goldsmith's Golem (1989)
- Letter: The "Eternals" Immortal (Thrilling Wonder Stories, March 1940) (1940)
- Letter: The "Eternals" Immortal (Thrilling Wonder Stories, March 1940) (1940) with Sam Muskowitz
- Letter: Weird vs. Science-Fantasy (Fantasy Review, April-May 1948) (1948)
- Lo! The Poor Forteans (1965)
- Lost Giant of American Science Fiction-A Biographical Perspective (1973)
- Me and My Shadow: Based on Several Interviews with John L. Nanovic (1990)
- Missionaries From the Sky: Introduction (1962)
- Mort Weisinger: The Superman Behind Superman (1964)
- Mr. Science Fiction: A Profile of Hugo Gernsback (1960)
- Nachwort (Ein moderner Magier) [German] (1980)
- Neglected Repository of Supernatural Fiction (1973)
- New Worlds: Introduction (1962)
- Nictzin Dyalhis: Mysterious Master of Fantasy (1991)
- Nonstop to Mars: Introduction (1962)
- Novelist (1975)
- Nycon: The First World Science Fiction Convention (1950)
- Olaf Stapledon: Cosmic Philosopher (1960)
- Olaf Stapledon: The Man Behind the Works (1978)
- Omega, the Man: Introduction (1963)
- On Fans and Fandom (Fantasy-Times, September 8, 1946) (1946)
- Our of Surfeit Comes Specialization (1992)
- Out of the Sub-Universe: Introduction (1961)
- Out of the Sub-Universe: Introduction (1961) with uncredited
- P. Schuyler Miller: February 21, 1912—October 13, 1974 (1975)
- P.S.'s Feature Flash (Planet Stories, Winter 1941) (1941)
- Peace and Olaf Stapledon (1979)
- Philcon '86 (1987)
- Philip José Farmer: Sex & Science Fiction (1964)
- Philip Wylie: The Saccharine Cynic (1960)
- Philly Conference to Be Held Oct. 27 (1946)
- Pilgrim's Progress: Prelude and Postscripts to the Publication of J. O. Bailey's Pilgrims Through Space and Time (1982)
- Planetoid 127: Introduction (1962)
- Poe's Influence on Science-Fiction (1996)
- Postface (Un magicien moderne) [French] (1985)
- Preface (Science Fiction by Gaslight) (1968)
- Preface (Terrors of the Sea) (1996)
- Preface (The Haunted "Pampero") (1992)
- Preface (Under the Moons of Mars) (1970)
- Presence of Mind: Introduction (1962)
- Professor Jonkin's Cannibal Plant: Introduction (1963)
- PS's Feature Flash (Planet Stories, Fall 1946) (1946)
- Psychiatry: The Invasion of the Incredible Headshrinkers (1976)
- Qu'est-ce qui fait brûler Bradbury ? [French] (1964)
- Ray Bradbury in France (1968)
- Reaching Our Audience (1973)
- Religion in Science Fiction: God, Space and Faith (1965)
- Religion: Space, God and Science Fiction (1965)
- Remote Projection (Introduction) (1968)
- Return to the Nightland: An Introduction (1977)
- Review of "Fantasy Calendar for 1950" (1950)
- Review of the nonfiction work "The Universe We Live In" by John Robinson (1953)
- Ricky Slavin: A Memoir (1987)
- Ritratto di A. E. Van Vogt [Italian] (1969)
- Robert A. Heinlein [Italian] (1972)
- Robert Heinlein: Man, Myth or Monster? (1961)
- S. Fowler Wright: SF's Devil's Disciple (1965)
- Science Fiction Upswing: A Cyclic Condition (1954)
- Setting the Record Straight: A Response to Lundwall's 'Adventures in the Pulp Jungle' (1986)
- Shiel and Heard: The Neglected Thinkers of SF (1960)
- Ship of Darkness: Introduction (1961)
- Slingin' the Scientifictional Bull (1944)
- Sobre Edmond Hamilton [Spanish] (2012)
- Space Opus: Philip Wylie (1963)
- Space, God, and Science Fiction (1965)
- Spawn of the Ray: Introduction (1962)
- Stanley G. Weinbaum: A Critical Appraisal (1946)
- Stanley G. Weinbaum: Dawn of Flame (1959)
- Studies in Science Fiction 10: Fitz-James O'Brien (1961)
- Studies in Science Fiction 13: Olaf Stapledon (1961)
- Studies in Science Fiction 14: Philip Wylie (1961)
- Studies in Science Fiction 15: Shiel and Heard (1961)
- Studies in Science Fiction 2: Arthur Conan Doyle (1959)
- Studies in Science Fiction 3: H. G. Wells (1959)
- Studies in Science Fiction 4: Edgar Allan Poe (1959)
- Studies in Science Fiction 5: Cyrano de Bergerac (1960)
- Studies in Science Fiction 6: The Marvellous A. Merritt (1960)
- Studies in Science Fiction 7: Edgar Rice Burroughs (1960)
- Studies in Science Fiction 8: Jules Verne (1960)
- Studies in Science Fiction 9: H. P. Lovecraft (Science Fantasy, December 1960) (1960)
- Studies in Science Fiction: 11. Stanley G. Weinbaum (1961)
- Sturgeon Bibliography (1962)
- Take Back Your Blarney (1940)
- Teen-Agers: Tom Swift and the Syndicate (1976)
- Tennessee Williams, Boy Wonder (1957)
- The Airlords of Han: Introduction (1962)
- The Amazing Edgar Rice Burroughs (1958)
- The Business Up Front (The Bulletin of the Science Fiction Writers of America, May 1982) (1982) with Richard Kearns and Marshall B. Tymn and Cherie Wilkerson
- The Case Against Modern Science Fiction (1952)
- The Case for Science-Fiction (1949)
- The Cave (Introduction) (1969)
- The Chamber of Life: Introduction (1962)
- The Coming of the Ice: Introduction (1961)
- The Coming of the Little People: Introduction (1964)
- The Compleat Fabian (1995)
- The Cosmic Express: Introduction (1961)
- The Cosmic Relic: Introduction (1961)
- The Cosmic Reporter (Fantasy-Times, October 13, 1946) (1946) with Thomas S. Gardner and Lane Stannard
- The Cosmic Reporter (Fantasy-Times, September 8, 1946) (1946)
- The Council of Drones: Introduction (1962)
- The Creator: Introduction (1961)
- The Dark Plots of One Shiel (1983)
- The Darkness on Fifth Avenue: Introduction (1962)
- The Dead Remember: Introduction (1961)
- The Debt of the Film Industry to Science Fiction Classics (1970)
- The Devil Came to Our Valley: Introduction (1964)
- The Devil In Hollywood: Introduction (1963)
- The Dragon of Iskander: Introduction (1962)
- The Early Years (1975)
- The Exterminator: Introduction (1961)
- The Eyrie (Weird Tales, Summer 1974) (1974)
- The Eyrie (Weird Tales, Summer 1974) (1974) with The Editor
- The Eyrie (Weird Tales, Winter 1973) (1973)
- The Eyrie (Weird Tales, Winter 1973) (1973) with The Editor
- The Fabulous Fantast (1958)
- The Fabulous Fantast - Fitz-James O'Brien (1958)
- The Fabulous Fantast, Fitz-James O'Brien (1958)
- The Fantasy Corner (Fantasy Times, June 1944) (1944)
- The Fantasy Corner (Fantasy Times, June 1944) (1944) with uncredited
- The Fantasy Corner (Fantasy Times, May 1944) (1944)
- The Fantasy Corner (Fantasy Times, May 1944) (1944) with uncredited
- The Final Years (1975)
- The Flying Fool: Introduction (1961)
- The Flying Fool: Introduction (1961) with uncredited
- The Forgotten Creator of Weird Tales (1965)
- The Frome Finale (1985)
- The Future in Present Tense (1963)
- The Garden of Fear: Introduction (1961)
- The Gernsback "Magazines" No One Knows (1971)
- The Growth of Science Fiction from 1900 to the Early 1950s (1992)
- The Human Zero: Introduction (1962)
- The Hungry Guinea-Pig: Introduction (1961)
- The Ice Man: Introduction (1962)
- The Immortal Storm II: A History of Science-Fiction Fandom: Part Three (1996)
- The Immortal Storm II: A History of Science-Fiction Fandom: Part Two (1995)
- The Inscrutable American Angle (1939)
- The Jew in Science Fiction (1966)
- The Last Evolution: Introduction (1961)
- The Life, Work and Times of A. Merritt (1985)
- The Light Fantastics of Robert W. Chambers (1974)
- The Lore of H. P. Lovecraft (1963)
- The Lost Machine: Introduction (1960)
- The Man Next Door: Introduction (1963)
- The Man Who Saw the Future: Introduction (1961)
- The Marvelous A. Merritt (1959)
- The Marvelous A. Merritt - Lord of Fantasy (1959)
- The Most Popular Stories in Weird Tales 1924 to 1940 (2017)
- The Most Popular Stories in Weird Tales 1924 to 1940: With Statistics and Analytical Commentary (1983)
- The Mother: Introduction (1961)
- The Negro in Science Fiction (1967)
- The OAK-ERB Feud (1971)
- The Origins of Science Fiction Fandom: A Reconstruction (1990)
- The Other Side of the Curtain - A Reflection of the Future (1966) with Roger Elwood
- The Planet of the Double Sun: Introduction (1962)
- The Posthumous Acceptance of William Hope Hodgson 1918-1943 (1992)
- The Prince of Liars: Introduction (1963)
- The Prophetic Edgar Allan Poe (1958)
- The Psychiatric Syndrome in Science Fiction (1967)
- The Real Earth Satellite Story (1957)
- The Return of Sam Inscrutable (1940)
- The Rise and Fall of the First Gernsback Empire (1994)
- The Root of Ampoi: Introduction (1961)
- The Saga of "Skylark" Smith (1964)
- The Saintly Heresy of Clifford D. Simak (1962)
- The Science Fiction Collector (Satellite Science Fiction, April 1957) (1957)
- The Science Fiction Collector (Satellite Science Fiction, December 1957) (1957)
- The Science Fiction Collector (Satellite Science Fiction, February 1957) (1957)
- The Science Fiction Magazine: A Forum for New Ideas (2012) with Joseph Wrzos
- The Science Fiction Magazine: A Forum for New Ideas (2012) with Joe Wrzos
- The Science Fiction Pulps (1997)
- The Secret Lives of Henry Kuttner (1962)
- The Sense of Wonder (1967)
- The Shadow Out of Space: Introduction (1962)
- The Short Stories of Charles Fort (1976)
- The Significance of the First Post War Science Fiction Convention (1946)
- The Singing Sands of Prester John: Introduction (1963)
- The Sleuth in Science Fiction (1966)
- The Sons of Frankenstein (1958)
- The Source of Edgar Rice Burroughs' The Gods of Mars, and Other Positive and Argumentative Statements (1969)
- The Strange Case of Murray Leinster (1961)
- The Struggle to Create Beauty from the Horrors of Reality: Douglas H. Keller's Fantasy Stories (1996)
- The Super-Sleuths of Science Fiction (1966)
- The Tale of the Atom: Introduction (1963)
- The Time Stream (Fantasy Reporter, June 1942) (1942)
- The Time Stream (Fantasy Times, April 1944) (1944)
- The Time Stream (Fantasy Times, June 1944) (1944)
- The Time Stream (Fantasy Times, May 1944) (1944)
- The Time Stream: Editorial (1941)
- The Titan: Introduction (1962)
- The Ultimate Hugo Gernsback (1971)
- The Undersea Tube: Introduction (1961)
- The Unprodigal Publisher Returns (1946)
- The Veiled Feminists of Atlantis (Introduction) (1968)
- The Willy Ley Story (1966)
- The Wolf Woman: Introduction (1963)
- The Woman Who Wrote "Citadel of Fear" (1970)
- The Wonder of Weinbaum (1962)
- The Wonders of H. G. Wells (1958)
- The World Changes (1939)
- The World, the Devil, and M. P. Shiel (1963)
- The Worlds of A. E. van Vogt (1961)
- The Young Old Man: Introduction (1962)
- Theodore Sturgeon [Italian] (1974)
- Theodore Sturgeon: No More Than Human (1962)
- This is the ESFA (1953)
- Time Waits For No One (1945)
- To Barsoom and Back with Edgar Rice Burroughs (1963)
- To Heaven Standing Up: Introduction (1961)
- To Mars and Venus in the Gay Nineties (1960)
- Tom Swift and the Syndicate (1966)
- Tribute to Walter Sullivan (1946)
- Two Thousand Years of Space Travel (1959)
- Uncrowned Masters (1940)
- Unexplained Phenomena: Lo! The Poor Forteans (1976)
- Unser Leitartikel: Der Ursprung von Science-Fiction [German] (1957)
- Unto Us a Child Is Born: Introduction (1961)
- Virgil Finlay (1971)
- Virgil Finlay [French] (1971)
- Virgil Finlay, Dean of Science Fiction Artists (1965)
- Voyagers Through Eternity: A History of Science-Fiction from the Beginning to H.G. Wells (Part 16 of 16) (1996)
- W.C. Morrow: Forgotten Master of Horror - First Phase (1992)
- War: Warriors of If (1976)
- Weird Tales Creator (1970)
- What Makes Bradbury "Burn"? (1961)
- What Man Can Imagine ... (Amazing Stories, April 1956) (1956)
- When Women Rule (1967)
- Why "The Man Who Evolved" is my Favorite (1940)
- William Hope Hodgson - Novelist (1973)
- William Hope Hodgson - The Early Years (1973)
- William Hope Hodgson - The Final Years (1973)
- William Hope Hodgson's Sister: Roadblock to Recognition (1996)
- William S. Baring Gould at Queens SFL; QSFL Protests Shaver's Stories; 29 Present at October Meeting (1946) with Alvin R. Brown and James V. Taurasi
- Willy Ley in the U.S.A., Part III: Losing the Last One (1987)
- Willy Ley in the U.S.A., Part Two: Fiction, Fandom, Fame (1987)
- Willy Ley: Forgotten Prophet of the Space Age (1987)
- Women's Liberation: When Women Rule (1976)
- "... And Some Were Human" (1949) by Lester del Rey
- A Martian Odyssey and Others (1950) by Stanley G. Weinbaum
- A Treasury of Science Fiction (1948) by Groff Conklin
- Beyond Thirty & The Man-Eater (1956) by Edgar Rice Burroughs
- Beyond This Horizon (1949) by Robert A. Heinlein
- Carnacki, the Ghost-Finder (1949) by William Hope Hodgson
- Children of the Atom (1953) by Wilmar H. Shiras
- Children of Wonder (1953) by William Tenn
- City (1953) by Clifford D. Simak
- Dwellers in the Mirage and The Face in the Abyss (1953) by A. Merritt
- E Pluribus Unicorn (1956) by Theodore Sturgeon
- Edgar Rice Burroughs Biblio (1956) by Bradford M. Day
- Final Blackout (1949) by L. Ron Hubbard
- Flatland (1952) by Edwin A. Abbott
- Flying Saucers (1953) by Donald H. Menzel
- Future Tense (1953) by Kendell F. Crossen
- Grumbles from the Grave (1990) by Robert A. Heinlein and Virginia Heinlein
- Highways in Hiding (1957) by George O. Smith
- In Search of Wonder (1956) by Damon Knight
- In Search of Wonder (1956) by Damon Knight (co-reviewed with Damon Knight)
- Islands in the Sky (1953) by Arthur C. Clarke
- Judgment Night (1953) by C. L. Moore
- Life Everlasting and Other Tales of Science, Fantasy and Horror (1949) by David H. Keller, M.D.
- Lords of Serpent Land (1996) by Alan Connell
- Modern Science Fiction: Its Meaning and Its Future (1953) by Reginald Bretnor
- Nerves (1957) by Lester del Rey
- Physics and Medicine of the Upper Atmosphere (1953) by Otis Benson
- Preview for Tomorrow (1953) by Bruce Bliven
- Quadratic (1953) by William L. Crawford
- Roads (1950) by Seabury Quinn
- Rockets, Missiles & Space Travel (1957) by Willy Ley
- Science Fiction and Fantasy Book Review Index: 1980-1984 (1986) by H. W. Hall
- Science Fiction and Fantasy REference Index, 1875-1985: An International Author Index to History and Criticism (1988) by H. W. Hall
- Science Fiction and Fantasy REference Index, 1875-1985: An International Subject Index to History and Criticism (1988) by H. W. Hall
- Science Fiction Book Review Index, 1923-1973 (1975) by H. W. Hall
- Science-Fiction Handbook (1953) by L. Sprague de Camp and Catherine A. Crook
- Sinister Barrier (1950) by Eric Frank Russell
- Slaves of Sleep (1950) by L. Ron Hubbard
- Star Science Fiction Stories (1953) by Frederik Pohl
- Strange Ports of Call (1949) by August Derleth
- Strange Worlds (1953) by Ralph Milne Farley
- Survey of Modern Fantasy Literature (1984) by Frank N. Magill
- Talbot Mundy Biblio (1957) by Bradford M. Day
- The Black Flame (1949) by Stanley G. Weinbaum
- The Black Wheel (1949) by A. Merritt and Hannes Bok
- The Checklist of Fantastic LIterature (1949) by Everett F. Bleiler
- The Circus of Dr. Lao and Other Improbable Stories (1957) by Ray Bradbury
- The Complete Book of Space Travel (1956) by Albro T. Gaul
- The Continent Makers and Other Tales of the Viagens (1953) by L. Sprague de Camp
- The Dark Other / The Undesired Princess (1953) by uncredited
- The Demolished Man (1953) by Alfred Bester
- The Exploration of Space (1953) by Arthur C. Clarke
- The Fourth Book of Jorkens (1950) by Lord Dunsany
- The Futurians (1978) by Damon Knight
-
The Green Odyssey (1957)
by
Philip José Farmer?Philip Jose Farmer
- The John W. Campbell Letters, Volume 1 (1986) by Perry A. Chapdelaine, Sr. and Tony Chapdelaine and George Hay
- The Lungfish, the Dodo and the Unicorn (1950) by Willy Ley
- The Next Million Years (1953) by Charles Galton Darwin
- The People of the Comet (1949) by Austin Hall
- The Petrified Planet (1953) by uncredited
- The Planet of Youth (1953) by Stanton A. Coblentz
- The Porcelain Magician (1950) by Frank Owen
- The Pulp Magazine Index: First Series (1990) by Leonard A. Robbins
- The Radio Man (1950) by Ralph Milne Farley
- The Red Peri (1953) by Stanley G. Weinbaum
- The Robot and the Man (1953) by Martin Greenberg
- The Solitary Hunters and the Abyss (1950) by David H. Keller, M.D.
- The Sunken World (1950) by Stanton A. Coblentz
- The Titan (1953) by P. Schuyler Miller
- The Torch (1949) by Jack Bechdolt
- The Wheels of If (1950) by L. Sprague de Camp
- The World of A (1949) by A. E. van Vogt
- To the End of Time (1953) by Olaf Stapledon
- Tomorrow and Tomorrow (1957) by Hunt Collins
- Triplanetary (1949) by Edward E. Smith
- Who Goes There? (1949) by John W. Campbell
- Witches Three (1953) by uncredited
- Without Sorcery (1950) by Theodore Sturgeon
- Worlds of Tomorrow (1953) by August Derleth