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Anthologies
- Androids, Time Machines and Blue Giraffes (1973) with Roger Elwood
- Beware More Beasts (1975) with Roger Elwood
- Beware the Beasts (1970) with Roger Elwood
- Dracula's Guest and Other Stories (1972)
- Eight Strange Tales (1972)
- Feast of Fear (1977)
- Fri oss fra udyrene [Norwegian (Bokmal)] (1976) with Roger Elwood
- Gooseflesh! (1974)
- Horror Hunters (1971) with Roger Elwood
- More Little Monsters (1973) with Roger Elwood
- Nightmare Garden (1976)
- Satan's Pets (1972)
- Skrekkjegere [Norwegian (Bokmal)] (1976) with Roger Elwood
- The Devil's Generation (1973)
- The Little Monsters (1969) with Roger Elwood
- The Mummy Walks Among Us (1971)
- The Oddballs (1973)
- The Venus Factor (1972) with Roger Elwood
- Underlige fortellinger [Norwegian (Bokmal)] (1973)
- Wizards and Warlocks (1972)
- Young Demons (1972) with Roger Elwood
- Zwischen Mitternacht und Jenseits [German] (1978) with Roger Elwood
- Future Forum (Future, July 1978) (1978) with Forrest J. Ackerman and Poul Anderson and John Brunner and L. Sprague de Camp and David Gerrold and Joe Haldeman and Ilya Salkind and Bjo Trimble
- Future Forum (Future, July 1978) (1978) with Forrest J. Ackerman and Poul Anderson and John Brunner and L. Sprague de Camp and David Gerrold and Joe W. Haldeman and Ilya Salkind and Bjo Trimble
- Introduction (Dracula's Guest and Other Stories) (1972)
- Introduction (Eight Strange Tales) (1972)
- Introduction (The Devil's Generation) (1973)
- Letter (Crypt of Cthulhu, Hallowmas 1986) (1986)
- Letter (Science Fiction Review, March 1971) (1971)