- Book (Non-Fiction): "Edgar Rice Burroughs: Master of Adventure" (1965)
- Novel: "One Million Centuries" (1967)
- Book (Non-Fiction): "All in Color for a Dime" (1970) [with Don Thompson]
- Novel: Sacred Locomotive Flies (1971)
- Book (Non-Fiction): "The Comic-Book Book" (1973) [with Don Thompson]
- Novel: "Into the Aether" (1974)
- Novel: "The Crack in the Sky" (1976) [re-published in the UK as "Fool's Hill" (1978)]
- Novel: "Sandworld" (1976)
- Novel: "Lisa Kane" (1976)
- Novel: "The Triune Man" (1976)
- Novel: "Sword of the Demon" (1977)
- Novel: "The Return of Skull Face" (1977) [with Robert E. Howard]
- Novel: "Space War Blues" (1978)
- Collection: "The Ova Hamlet Papers" (1979)
- Anthology: "What If? Volume 1" (1980)
- Anthology: "What If? Volume 2" (1981)
- Novel: "Lovecraft's Book" (1985) [later re-published unexpurgated as "Marblehead" (2006]
- Novel (Mystery): "The Comic Book Killer" (1988)
- Novel: "The Adventures of Professor Thintwhistle and His Incredible Aether Flyer" (1991) [with Steve Stiles]
- Novel (Mystery): "The Bessie Blue Killer" (1994)
- Novel (Mystery): "The Sepia Siren Killer" (1994)
- Novel (Mystery): "The Cover Girl Killer" (1995)
- Collection: "Before...12:01...and After" (1996)
- Novel (Mystery): "The Siver Chariot Killer" (1996)
- Novel (Mystery): "The Radio Red Killer" (1997)
- Anthology: "The Investigations of Avram Davidson" (1999) [with Grania Davis]
- Collection: "Claremont Tales" (2001)
- Book (Non-Fiction): "The Great American Paperback" (2001)
- Collection (Mystery): "One Murder at a Time: The Casebook of Lindsey & Plum" (2001)
- Collection: "Claremont Tales II" (2002)
- Book (Non-Fiction): "The Best of Xero" (2004) [with Pat Lupoff]
- Collection: "Terrors" (2005)
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