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Nonfiction Series
- Proceedings of the J. Lloyd Eaton Conference on Science Fiction and Fantasy Literature
- 1 Bridges to Science Fiction (1980) with Mark Rose and George E. Slusser
- Preface (Bridges to Science Fiction) (1980) with Mark Rose and George E. Slusser
- The Unconscious, Fantasy, and Science Fiction: Transformations in Bradbury's Martian Chronicles and Lem's Solaris (1982)
- Fahrenheit 451 and the "Cubby-Hole Editors" of Ballantine Books (1983)
- Noise, Information, and Statistics in Stanislaw Lem's The Investigation (1986)
- Aliens in the Supermarket: Science Fiction and fantasy for "Inquiring Minds" (1987)
- The Death and Rebirth of Astounding Stories: A Systems Analysis (2003)