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| Other views: | Awards Alphabetical Chronological |
Nonfiction
- H. G. Wells (1986)
- Olaf Stapledon: Speaking for the Future (1994)
- Imagining Mars: A Literary History (2011)
- Teaching the Course in Fantasy: An Elvish Counsel (1981)
- Pure and Applied Fantasy, or From Faerie to Utopia (1982)
- The Correspondence of Olaf Stapledon and H. G. Wells, 1931-1942 (1982)
- A Long Day's Dying: The Elves of J.R.R. Tolkien and Sylvia Townsend Warner (1985)
- Introduction (Kindred) (1988)
- In the Palace of Green Porcelain: Artefacts from the Museums of Science Fiction (1991) also appeared as:
- Wells's Common Readers (1991)
- Il colore della fantascienza [Italian] (1994)
- A Note on Texts (An Olaf Stapledon Reader) (1997)
- Introduction (An Olaf Stapledon Reader) (1997)
- Sign, Symbol, Power: the New Martian Novel (2000)
- The Grandeur of H. G. Wells (2005)
- From Invasion to Liberation: Alternative Visions of Mars, Planet of War (2012)
- Introduction (A Short, Sharp Shock) (2015)
- Reader's Guide (The Kindred) (unknown)