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Omnibus
- Apeman! (2021) [O] with T. M. Gray and Jon A. Schlenker
- Asimov's Ghosts / Asimov's Monsters (1988) [O] with Isaac Asimov and Martin H. Greenberg
- Asimov's Ghosts / Asimov's Monsters (1988) [O] with Isaac Asimov and Martin Greenberg (1941-2011) and Charles Waugh
- Faszination der Science Fiction [German] (1985) [O] with Isaac Asimov and Martin W. Greenberg
- Isaac Asimov's Magical Worlds of Fantasy: Witches & Wizards (1985) [O/1-2] with Isaac Asimov and Martin H. Greenberg
- The Rivals of H. G. Wells, Vol. II: (Seven Novellas and Short Novels) (2024) [O] with Don Wismer
- The Seven Cardinal Virtues of Science Fiction / Catastrophes! (unpublished) [O] with Isaac Asimov and Martin H. Greenberg
- The Seven Deadly Sins and Cardinal Virtues of Science Fiction (1982) [O] with Isaac Asimov and Martin H. Greenberg
- The Seven Deadly Sins and Cardinal Virtues of Science Fiction (1982) [O] with Isaac Asimov and Martin Harry Greenberg
- 101 Science Fiction Stories (1986) with Jenny-Lynn Azarian and Martin H. Greenberg
- 101 Science Fiction Stories (1986) with Martin H. Greenberg and Jenny-Lynn Waugh
- 13 Short Fantasy Novels (1984) with Isaac Asimov and Martin H. Greenberg
- 13 Short Horror Novels (1987) with Martin H. Greenberg
- 13 Short Science Fiction Novels (1985) with Isaac Asimov and Martin H. Greenberg
- 14 Vicious Valentines (1988) with Martin H. Greenberg and Rosalind M. Greenberg
- 14 Vicious Valentines (1988) with Martin Harry Greenberg and Rosalind M. Greenberg
- A Knife for Tomaso and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- A Newbery Halloween (1993) with Martin H. Greenberg
- A Treasury of American Horror Stories (1985) with Martin H. Greenberg and Frank D. McSherry, Jr.
- A Treasury of American Horror Stories (1985) with Martin H. Greenberg and Frank McSherry, Jr.
- A Treasury of American Mystery Stories (1989) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Adoniram and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- African Horrors (2023) with Jeffrey A. Linscott and Jon A. Schlenker
- After the End (1981) with Isaac Asimov and Martin H. Greenberg
- Alternative Histories (1986) with Martin H. Greenberg
- Animal Brigade 3000 (1994) with Martin H. Greenberg
- Animal Brigade 3000 (1994) with Martin Harry Greenberg and Charles Waugh
- Apemen!: Classic Tales of Anthropoids (2013) with T. M. Gray
- Asimov's Extraterrestrials (1986) with Isaac Asimov and Martin Greenberg (1941-2011) and Charles Waugh
- Asimov's Ghosts (1986) with Isaac Asimov and Martin Greenberg (1941-2011) and Charles Waugh
- Asimov's Monsters (1986) with Isaac Asimov and Martin H. Greenberg
- Asimov's Monsters (1988) with Isaac Asimov and Martin Greenberg (1941-2011) and Charles Waugh
- Asimov's Mutants (1986) with Isaac Asimov and Martin H. Greenberg
- Atlantis (1988) with Isaac Asimov and Martin H. Greenberg
- Back from the Dead (1991) with Martin H. Greenberg
- Barbarians (1986) with Robert Adams and Martin H. Greenberg
- Baseball 3000 (1981) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Battlefields Beyond Tomorrow: Science Fiction War Stories (1987) with Martin H. Greenberg
- Before Weird Tales: Early 20th Century Stories of Horror and the Supernatural (2013) with Araminta Star Matthews
- Body Armor: 2000 (1986) with Martin H. Greenberg and Joe Haldeman
- Body Armor: 2000 (1986) with Martin Harry Greenberg and Joe Haldeman
- Bootcamp 3000 (1992) with Martin H. Greenberg
- Bootcamp 3000 (1992) with Martin Harry Greenberg
- Bug Awful (1984) with Isaac Asimov and Martin H. Greenberg
- Bug Awful (1984) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- Bug Awful (2023) with Jeffrey A. Linscott and Kathy Sweet Waugh
- Catastrofi! [Italian] (1984) with Isaac Asimov and Martin H. Greenberg
- Catastrophes! (1981) with Isaac Asimov and Martin H. Greenberg
- Catastrophes! (1981) with Isaac Asimov and Martin Harry Greenberg
- Caught in the Organ Draft: Biology in Science Fiction (1983) with Isaac Asimov and Martin H. Greenberg
- Cavemen (2021) with Jeffrey A. Linscott and Jon A. Schlenker
- Children of the Future (1984) with Isaac Asimov and Martin H. Greenberg
- Children of the Future (1984) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- Christmas on the Prairie and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Cinemonsters (1987) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Civil War Ghosts (1991) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Comets (1986) with Isaac Asimov and Martin H. Greenberg
- Commando Brigade 3000 (1994) with Martin H. Greenberg
- Commando Brigade 3000 (1994) with Martin Harry Greenberg and Charles Waugh
- Computer Crimes and Capers (1983) with Isaac Asimov and Martin H. Greenberg
- Cosmic Knights (1985) with Isaac Asimov and Martin H. Greenberg
- Crimini E Misfatti Al Computer [Italian] (1996) with Isaac Asimov and Martin H. Greenberg
- Cults of Horror (1990) with Martin H. Greenberg
- Cults of Horror (1990) with Martin Harry Greenberg
- Cults!: An Anthology of Secret Societies, Sects, and the Supernatural (1983) with Martin H. Greenberg
- Curses (1989) with Isaac Asimov and Martin H. Greenberg
- Damned Yankees (2020) with Rick Hautala
- Dancing Tom and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Dangerous Vegetables (1998) with Martin H. Greenberg and Keith Laumer
- Der letzte Mensch auf Erden [German] (1984) with Isaac Asimov and Martin Harry Greenberg
- Devil Worshipers (1990) with Martin H. Greenberg
- Devils (1987) with Isaac Asimov and Martin H. Greenberg
-
Die 7 Todsünden der Science Fiction?Die 7 Todsuenden der Science Fiction[German] (1984) with Isaac Asimov and Martin H. Greenberg
- Die besten Computer-Krimis [German] (1987) with Isaac Asimov and Martin H. Greenberg
- Dixie Ghosts: Haunting Spine-chilling Stories from the American South (1988) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Drachenwelten [German] (1985) with Isaac Asimov and Martin Harry Greenberg
- Dragon Tales (1982) with Isaac Asimov and Martin H. Greenberg
- Dragon Tales (1982) with Isaac Asimov and Martin Harry Greenberg
- Dragon Warriors: Viking Myths and Legends (2023) with Jeffrey A. Linscott and Jon A. Schlenker
- Dragons & Dreams: A Collection of New Fantasy and Science Fiction Stories (1986) with Martin H. Greenberg and Jane Yolen
- Earth Invaded (1982) with Isaac Asimov and Martin H. Greenberg
- East Coast Ghosts (1989) with Martin H. Greenberg
- Eastern Ghosts (1990) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Egyptian Bizarre (2021) with Jeffrey A. Linscott and Jon A. Schlenker
- Encantamentos - Os mundos mágicos da fantasia [Portuguese] (1991) with Isaac Asimov and Martin H. Greenberg
- Encounters (1988) with Isaac Asimov and Martin H. Greenberg
- Extraterrestrials (1988) with Isaac Asimov and Martin H. Greenberg
- Faeries (1991) with Isaac Asimov and Martin H. Greenberg
- Fantastic Creatures: An Anthology of Fantasy and Science Fictions (1981) with Isaac Asimov and Martin H. Greenberg
- Fantastic Creatures: An Anthology of Fantasy and Science Fictions (1981) with Isaac Asimov and Martin Greenberg (1941-2011) and Charles Waugh
- Fantastic World War II (1990) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Fantastic World War II (1990) with Frank McSherry, Jr.
-
Fantasy-Erzählungen des 19. Jahrhunderts?Fantasy-Erzaehlungen des 19. Jahrhunderts[German] (1983) with Isaac Asimov and Martin H. Greenberg
- Flying Saucers (1982) with Isaac Asimov and Martin H. Greenberg
- Flying Saucers (1982) with Isaac Asimov and Martin Harry Greenberg
- For a Horse and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- For the Sake of Freedom and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Ghosts (1988) with Isaac Asimov and Martin H. Greenberg
- Ghosts of the Heartland (1990) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Giants (1985) with Isaac Asimov and Martin H. Greenberg
- Great American Ghost Stories (1991) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Great American Ghost Stories: Volume One (1992) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Great American Ghost Stories: Volume Two (1993) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Great Science Fiction: Stories by the World's Great Scientists (1985) with Isaac Asimov and Martin H. Greenberg
- Great Tales of Classic Science Fiction (1990) with Isaac Asimov and Martin H. Greenberg
- Great Tales of Lumberjacks and Woodsmen (2017) with Kathy Sweet Waugh
- Great Tales of the Golden Age of Science Fiction (1991) with Isaac Asimov and Martin H. Greenberg
- Hallucination Orbit: Psychology in Science Fiction (1983) with Isaac Asimov and Martin H. Greenberg
- Haunted Dixie: Great Ghost Stories from the American South (2008) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Haunted New England: Classic Tales of the Strange and Supernatural (1988) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Haunting Sea Stories (2023) with Robert Gray and T. M. Gray
- Hollywood Ghosts (1991) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Hollywood Unreel: Fantasies About Hollywood and the Movies (1982) with Martin H. Greenberg
- Hollywood Unreel: Fantasies About Hollywood and the Movies (1982) with Martin Harry Greenberg and Charles Waugh
- House Shudders (1987) with Martin H. Greenberg
- Humanoid Horrors (2020) with Jeffrey A. Linscott and Jon A. Schlenker
- I 7 Peccati Mortali Della FS [Italian] (1982) with Isaac Asimov and Martin H. Greenberg
- Il regno incantato [Italian] (1993) with Isaac Asimov and Martin H. Greenberg
- Intergalactic Empires (1983) with Isaac Asimov and Martin H. Greenberg
- Invariant [French] (1985) with Isaac Asimov and Martin H. Greenberg
- Invasions (1990) with Isaac Asimov and Martin H. Greenberg
- Isaac Asimov Presents Tales of the Occult (1989) with Isaac Asimov and Martin H. Greenberg
- Isaac Asimov Presents the Best Fantasy of the 19th Century (1982) with Isaac Asimov and Martin H. Greenberg
- Isaac Asimov Presents the Best Horror and Supernatural of the 19th Century (1983) with Isaac Asimov and Martin H. Greenberg
- Isaac Asimov Presents the Best Science Fiction Firsts (1984) with Isaac Asimov and Martin H. Greenberg
- Isaac Asimov Presents the Best Science Fiction of the 19th Century (1981) with Isaac Asimov and Martin H. Greenberg
- Isaac Asimov Presents the Best Science Fiction of the 19th Century (1981) with Isaac Asimov and Martin Greenberg (1941-2011)
- Jack the Ripper (2004) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Killing London (2021) with Don Wismer
- Le Olimpiadi della Follia [Italian] (1985) with I. Asimov and M. H. Greenberg and C. G. Waugh
- Lighthouse Hauntings: 12 Original Tales of the Supernatural (2002) with Martin H. Greenberg
- Lighthouse Horrors (1993) with Jenny-Lynn Azarian and Martin H. Greenberg
- Lighthouse Horrors (1993) with Jenny-Lynn Azarian and Martin Harry Greenberg
- Lighthouse Island and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Little Sioux Girl and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Lone Cowboy and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Love 3000 (1980) with Martin H. Greenberg
- Love 3000 (1980) with Martin H. Greenberg and Charles Waugh
- Mad Scientists (1982) with Isaac Asimov and Martin H. Greenberg
- Mad Scientists (1982) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- Magical Wishes (1986) with Isaac Asimov and Martin H. Greenberg
- Magische Schatten [German] (1987) with Martin Harry Greenberg and Richard Matheson
- Magos [Portuguese] (1990) with Isaac Asimov and Martin H. Greenberg
- Making Tracks: 23 Classic Railroad Stories (2013) with Jon A. Schlenker
- Mass. Hallucinations (2023) with Alex Miller
- Mercenaries of Tomorrow (1985) with Poul Anderson and Martin H. Greenberg
- Mit Sherlock Holmes durch Raum und Zeit (1) [German] (1987) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- Mit Sherlock Holmes durch Raum und Zeit (2) [German] (1987) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- Monster Brigade 3000 (1996) with Martin H. Greenberg
- Monster Brigade 3000 (1996) with Martin Harry Greenberg and Charles Waugh
- Monsters (1988) with Isaac Asimov and Martin H. Greenberg
- More Dixie Ghosts (1994) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Murder in the First Reel (1985) with Martin H. Greenberg and Bill Pronzini
- Murder in the First Reel (1985) with Martin Harry Greenberg and Bill Pronzini
- Mutants (1982) with Isaac Asimov and Martin H. Greenberg
- Mutants (1988) with Isaac Asimov and Martin H. Greenberg
- Mysterious Visions (1979) with Martin H. Greenberg and Joseph D. Olander
- Mysterious Visions (1979) with Martin Harry Greenberg and Joseph Olander
- Mythic Beasts (1988) with Isaac Asimov and Martin H. Greenberg
- Mythical Beasties (1986) with Isaac Asimov and Martin H. Greenberg
- Neanderthals (1987) with Martin H. Greenberg and Robert Silverberg
- New England Ghosts (1990) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Nightmares in Dixie: Thirteen Horror Tales from the American South (1987) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Northern Darkness: 19 Great Stories Set in the Northern Region of the American Continent (2024) with Jeffrey A. Linscott and Jon A. Schlenker
- Off the Rails: Strange and Fantastic Train Tales (2021) with Jeffrey A. Linscott and Jon A. Schlenker
- Orbite hallucination [French] (1985) with Isaac Asimov and Martin H. Greenberg
- Pine Tree Pioneers: 20 Tales of Early Mainers (2012) with Kathy Sweet Waugh
- Pirate Ghosts of the American Coast: Stories of Hauntings at Sea (1988) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Pirate Ghosts: Tales of Hauntings at Sea (2007) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Red Jack (1988) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Robot Warriors (1991) with Martin H. Greenberg
- Robot Warriors (1991) with Martin Harry Greenberg
- Robots (1989) with Isaac Asimov and Martin H. Greenberg
- Rod Serling's Night Gallery Reader (1987) with Martin H. Greenberg and Carol Serling
- Roots of Evil (2023) with Jessie Chazin and M. Grant Kellermeyer and Timothy S. Miller
- Sailing Into Danger: 15 Tales of Adventure (2013) with Carl Cramer
- Saved by the Belle (2013) with T. M. Gray
- Sci Fi Private Eye (1997) with Martin H. Greenberg
- Science Fiction A to Z (1982) with Isaac Asimov and Martin H. Greenberg
-
Science Fiction Erzählungen des 19.Jahrhunderts?Science Fiction Erzaehlungen des 19.Jahrhunderts[German] (1983) with Isaac Asimov and Martin H. Greenberg
- Science Fiction: Classic Stories from the Golden Age of Science Fiction (1991) with Isaac Asimov and Martin H. Greenberg
- Science Fiction: The Science Fiction Research Association Anthology (1988) with Martin H. Greenberg and Patricia S. Warrick
- Screamingly Funny: 27 Comedic Gems (2021) with Kathy Sweet Waugh
- Sherlock Holmes Through Time and Space (1984) with Isaac Asimov and Martin H. Greenberg
- Sherlock Holmes Through Time and Space (1984) with Isaac Asimov and Martin Harry Greenberg
- Space Dogfights (1992) with Algis Budrys and Martin H. Greenberg
- Space Dogfights (1992) with Algis Budrys and Martin Harry Greenberg
- Space Dreadnoughts (1990) with David Drake and Martin H. Greenberg
- Space Gladiators (1989) with David Drake and Martin H. Greenberg
- Space Gladiators (1989) with David Drake and Martin Harry Greenberg
- Space Infantry (1989) with David Drake and Martin H. Greenberg
- Space Infantry (1989) with David Drake and Martin Harry Greenberg
- Space Mail: Volume II (1982) with Isaac Asimov and Martin H. Greenberg
- Space Mail: Volume II (1982) with Isaac Asimov and Martin Harry Greenberg
- Space Shuttles (1987) with Isaac Asimov and Martin H. Greenberg
- Space Wars (1988) with Poul Anderson and Martin H. Greenberg
- Space-Fighters (1988) with Martin H. Greenberg and Joe Haldeman
- Space-Fighters (1988) with Martin Harry Greenberg and Joe Haldeman
- Spaceships & Spells (1987) with Martin H. Greenberg and Jane Yolen
- Spannende science fiction [Dutch] (1982) with Martin Harry Greenberg and Joseph Olander
- Spells (1985) with Isaac Asimov and Martin H. Greenberg
- Spooky Sea Stories (1991) with Frank D. McSherry, Jr.
- Starships (1983) with Isaac Asimov and Martin H. Greenberg
- Starships (1983) with Isaac Asimov and Martin Harry Greenberg
- Sternenschiffe (1) [German] (1987) with Isaac Asimov and Martin Harry Greenberg
- Sternenschiffe (2) [German] (1987) with Isaac Asimov and Martin Harry Greenberg
- Strange Maine (1986) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Supermen (1984) with Isaac Asimov and Martin H. Greenberg
- Supernatural Sleuths: 14 Mysterious Stories of Uncanny Crime (1996) with Martin H. Greenberg
- Supertanks (1987) with Martin H. Greenberg and Joe Haldeman
- Supertanks (1987) with Martin Harry Greenberg and Joe Haldeman
- Survive, or Die!: 21 Ultimate Adventures (2013) with T. M. Gray
- Tantalizing Locked Room Mysteries (1982) with Isaac Asimov and Martin H. Greenberg
- Tantalizing Locked Room Mysteries (1982) with Isaac Asimov and Martin Harry Greenberg
- Terrorists of Tomorrow (1986) with Poul Anderson and Martin H. Greenberg
- The 13 Crimes of Science Fiction (1979) with Isaac Asimov and Martin H. Greenberg
- The 13 Crimes of Science Fiction (1979) with Isaac Asimov and Martin Harry Greenberg
- The Arbor House Celebrity Book of Horror Stories (1982) with Martin H. Greenberg
- The Arbor House Treasury of Nobel Prize Winners (1983) with Martin H. Greenberg
- The Arbor House Treasury of Nobel Prize Winners (1983) with Martin H. Greenberg and Charles Waugh
- The Eternal City (1990) with David Drake and Martin H. Greenberg
- The Giant Book of Classic Cat Stories (2016) with Kathy Sweet Waugh
- The Giant Book of New World SF: Short Novels of the 1960s (1997) with Isaac Asimov and Martin H. Greenberg
- The Giant Book of Science Fiction Stories (1992) with Martin H. Greenberg and Jenny-Lynn Waugh
- The Highest Hit and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- The Horse of the War God and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- The Immortals (1984) with Isaac Asimov and Martin H. Greenberg
- The Immortals (1984) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- The Last Man on Earth (1982) with Isaac Asimov and Martin H. Greenberg
- The Last Man on Earth (1982) with Isaac Asimov and Martin Harry Greenberg
- The Mammoth Book of Classic Science Fiction: Short Novels of the 1930s (1988) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Fantastic Science Fiction: Short Novels of the 1970s (1992) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Golden Age Science Fiction (1991) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Golden Age Science Fiction: Short Novels of the 1940s (1989) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Modern Science Fiction: Short Novels of the 1980s (1993) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of New World Science Fiction: Short Novels of the 1960s (1991) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Short Fantasy Novels (1986) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Short Science Fiction Novels (1986) with Isaac Asimov and Martin H. Greenberg
- The Mammoth Book of Vintage Science Fiction: Short Novels of the 1950s (1990) with Isaac Asimov and Martin H. Greenberg
- The Rivals of H. G. Wells, Vol. I (Short Stories and Novelettes) (2021) with Don Wismer
- The Science Fictional Dinosaur (1982) with Martin H. Greenberg and Robert Silverberg
- The Science Fictional Olympics (1984) with Isaac Asimov and Martin H. Greenberg
- The Science Fictional Solar System (1979) with Isaac Asimov and Martin H. Greenberg
- The Science Fictional Solar System (1979) with Isaac Asimov and Martin Harry Greenberg
- The Seven Cardinal Virtues of Science Fiction (1981) with Isaac Asimov and Martin H. Greenberg
- The Seven Cardinal Virtues of Science Fiction (1981) with Isaac Asimov and Martin Harry Greenberg
- The Seven Deadly Sins of Science Fiction (1980) with Isaac Asimov and Martin H. Greenberg
- The Seven Deadly Sins of Science Fiction (1982) with Isaac Asimov and Martin Harry Greenberg
- The Twelve Frights of Christmas (1986) with Isaac Asimov and Martin H. Greenberg
- The Twilight Zone: The Original Stories (1985) with Martin Harry Greenberg and Richard Matheson
- The Twilight Zone: The Original Stories (1985) with Martin H. Greenberg and Richard Matheson
- The Ultimate Eerie Pennsylvania: 21 Strange Stories (2023) with Jeffrey A. Linscott and Jon A. Schlenker
- The Wise Soldier of Sellebak and Other Selections by Newbery Authors (2001) with Martin H. Greenberg
- Thinking Machines (1981) with Isaac Asimov and Martin H. Greenberg
- Those Amazing Electronic Thinking Machines! (1983) with Isaac Asimov and Martin H. Greenberg
- Those Amazing Electronic Thinking Machines! (1983) with Isaac Asimov and Martin S. Greenberg and Charles H. Waugh
- Time Warps (1984) with Isaac Asimov and Martin H. Greenberg
- Time Warps (1984) with Isaac Asimov and Martin Harry Greenberg and Charles Waugh
- Time Wars (1986) with Poul Anderson and Martin H. Greenberg
- Time Wars (2004) with Martin H. Greenberg and Charles Waugh
- Tin Stars (1986) with Isaac Asimov and Martin H. Greenberg
- Tomorrow's TV (1982) with Isaac Asimov and Martin H. Greenberg
- Tooth and Claw: Classic Tales of Vampires and Werewolves (2013) with T. M. Gray
- Travels Through Time (1981) with Isaac Asimov and Martin H. Greenberg
- TV: 2000 (1982) with Isaac Asimov and Martin H. Greenberg
- TV: 2000 (1983) with Isaac Asimov and Martin Harry Greenberg
- Uncollected Stars (1986) with Piers Anthony and Martin H. Greenberg and Barry N. Malzberg
- Up From the Depths: Horrifying Aquatic Monsters (2023) with T. M. Gray and Jeffrey A. Linscott
- Utopia der Detektive [German] (1986) with Isaac Asimov and Martin H. Greenberg
- Vampire [German] (1988) with Martin Greenberg (1941-2011)
- Vamps: An Anthology of Female Vampire Stories (1987) with Martin H. Greenberg
- Vamps: Blood-Chilling Tales of Lady Vampires (2007) with Martin H. Greenberg
- Weird Trails (2019) with Jeffrey A. Linscott and Cynthia Ward
- Weird Trails (2019) with Jeffrey Linscott and Cynthia Ward
- Western Ghosts: Haunting, Spine-Chilling Stories from the American West (1990) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Wild Inventions (1981) with Isaac Asimov and Martin H. Greenberg
- Witches (1984) with Isaac Asimov and Martin H. Greenberg
- Wizards (1983) with Isaac Asimov and Martin H. Greenberg
- World's 25 Most Popular Ghost Stories (of the 19th Century) (2013) with T. M. Gray
- World's Best Pirate Stories (2020) with Alex Miller
- Yankee Witches (1988) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Young Extraterrestrials (1984) with Isaac Asimov and Martin H. Greenberg
- Young Ghosts (1985) with Isaac Asimov and Martin H. Greenberg
- Young Immortals (1985) with Isaac Asimov and Martin H. Greenberg
- Young Monsters (1985) with Isaac Asimov and Martin H. Greenberg
- Young Mutants (1984) with Isaac Asimov and Martin Greenberg and Charles Waugh
- Young Mutants (1984) with Isaac Asimov and Martin H. Greenberg
- Young Star Travelers (1986) with Isaac Asimov and Martin H. Greenberg
- Young Witches & Warlocks (1987) with Isaac Asimov and Martin H. Greenberg
- Science Fiction and Fantasy Series and Sequels: A Bibliography (1986) with Tim Cottrill and Martin H. Greenberg
- The Giant Omnibus of 3,302 Original Daffynitions (2019) with Joe Leff
- Long Way Home (1986)
- A Checklist of Science Fiction/Fantasy Works Containing Religious Themes or Motifs (1985) with Frank D. McSherry, Jr. and Robert Reilly
- A Selected List of Short Fiction Behind Mystery Movies (1985)
- A Selective and Annotated Bibliography of Short Stories About Cults (1983) with Frank D. McSherry, Jr.
- A Shade Treatise (1990)
- Author Biographies (Christmas on the Prairie) (2001) with Martin H. Greenberg
- Cults: An Introduction (1983) with Martin H. Greenberg
- Developing the Modern World (2017)
- Einführung: Warum es so viele ›Damen der Nacht‹ gibt [German] (1988)
-
Facts About Fans (1978)
with
Edwin P. Libby
and
Carol-Lynn Rössel Waugh?Carol-Lynn Roessel Waugh
- Facts About Fans (1978) with Edwin P. Libby and Carol-Lynn Waugh
- Foreword (The Human Zero: The Science Fiction Stories of Erle Stanley Gardner) (1981) with Martin H. Greenberg
- Further Reading (1982) with Martin H. Greenberg and Robert Silverberg
- Geologic Time Scale (1982) with Martin H. Greenberg and Robert Silverberg
- Glossary (The Science Fictional Dinosaur) (1982) with Martin H. Greenberg and Robert Silverberg
- Henry W. Shoemaker (2022) with T. M. Gray
- Introduction (13 Short Horror Novels) (1987)
- Introduction (African Horrors) (2023)
- Introduction (Apeman!) (2021) with T. M. Gray
- Introduction (Bug Awful) (2023)
- Introduction (Dragons and Dreams) (1986) with Martin H. Greenberg and Jane Yolen
- Introduction (Haunting Sea Stories) (2023)
- Introduction (Killing London) (2021) with Don Wismer
- Introduction (Love 3000) (1980) with Martin H. Greenberg
- Introduction (Love 3000) (1980) with Martin H. Greenberg and Charles Waugh
- Introduction (Mass. Hallucinations) (2023)
- Introduction (Off the Rails: Strange and Fantastic Train Tales ) (2021)
- Introduction (Sci-Fi Private Eye) (1997) with Martin H. Greenberg
- Introduction (Screamingly Funny: 27 Comedic Gems) (2021) with Kathy Sweet Waugh
- Introduction (The Rivals of H. G. Wells, Vol. I (Short Stories and Novelettes)) (2021)
- Introduction (The Rivals of H. G. Wells, Vol. II: (Seven Novellas and Short Novels)) (2024)
- Introduction (The Science Fictional Dinosaur) (1982) with Martin H. Greenberg and Robert Silverberg
- Introduction: Bright Darkness (1993)
- Introduction: East Coast Ghosts (1989) with Frank D. McSherry, Jr.
- Introduction: The Monster Matinee (1987)
- Introduction: The Monster Tour (A Treasury of American Horror Stories) (1985) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Introduction: Why There Are So Many "Ladies of the Night" (1987)
- Newbery Award-Winning Books (Christmas on the Prairie) (2001) with Martin H. Greenberg
- Notes (Hallucination Orbit: Psychology in Science Fiction) (1983) with Isaac Asimov
- Notes (Orbite hallucination) [French] (1985) with Isaac Asimov
- Preface (The Arbor House Celebrity Book of Horror Stories) (1982) with Martin H. Greenberg
- Selected Mesozoic Reptiles (1982) with Martin H. Greenberg and Robert Silverberg
- The Fantastic Mystery: A Neglected Genre (1979)
- The Monster Tour (1985) with Martin H. Greenberg and Frank McSherry, Jr.
- The Mystery Tour (1989) with Martin H. Greenberg and Frank D. McSherry, Jr.
- Why We Did This Book (2023)
Non-Genre Titles
Anthologies
- Bear Tales (2018) with T. M. Gray
- Brave Women (2022) with William Gorden and Kathy Sweet Waugh
- Fiction's First Women Detectives: 18 Classic Stories, Vol. 1 (2021) with T. M. Gray
- From Out of the Kitchen (Women's Fight for Careers) (2021) with Jennifer A. Schlenker and Jon A. Schlenker and Lori B. Schlenker
- Frontier Women: Twenty-Six Classic Tales (2020) with Jeffrey A. Linscott and Kathy Sweet Waugh
- Making Tracks: Revised Edition: 24 Classic Railroad Stories (2022) with Jeffrey A. Linscott and Jon A. Schlenker
- Moose Tales (2015) with Mark Allardyce
- Psychology: A Literary Introduction (2014) with Laura Kati Corlew
- The Emerging "New Woman": American Women's Short Stories, 1865-1917 (2013) with Kathleen L. Nichols
- The Giant Book of Classic Bird Stories (2017) with Kathy Sweet Waugh
- The Giant Book of Classic Civil War Stories (unknown) with Jon A. Schlenker
- The Giant Book of Classic Romance Stories (2014) with T. M. Gray
- The Rivals of Moby Dick (2022) with Jon A. Schlenker
- Tracked Down: 55 Years of Railroading Murders, Mysteries, and Mayhem (2022) with Jeffrey A. Linscott and Dr. Jon A. Schlenker