19 titles- Among the Dead and Other Events Leading up to the Apocalypse (New York: The Macmillan Company, 1973)
- Among the Dead and Other Events Leading up to the Apocalypse (New York: Collier Books, 1974)
- Phoenix without Ashes (Greenwich, Connecticut: Fawcett Gold Medal, 1975) with Harlan Ellison
- Cinnabar (New York: Macmillan Publishing Co, 1976)
- 2076: The American Tricentennial (New York: Pyramid, 1977)
- Wyoming Sun (Laramie, Wyoming: Jelm Mountain Press, 1980)
- Particle Theory (New York: Pocket Books/Timescape, 1981)
- Trilobyte (Eugene, Oregon: Axolotl Press, 1987)
- Neon Twilight (Eugene, Oregon: Pulphouse Publishing, 1990)
- The Man of the Future (Arvada, Colorado: Roadkill Press, 1990)
- The Cutter (Eugene, Oregon: Pulphouse Publishing, 1991)
- Fetish (Eugene, Oregon: Axolotl Press, 1991)
- The Thermals of August (Eugene, Oregon: Pulphouse Publishing, 1992)
- Aqua Sancta (Arvada, Colorado: Roadkill Press, 1993)
- Darker Passions (Arvada, Colorado: Roadkill Press, 1993)
- The Baku: Tales of the Nuclear Age (Burton, Michigan: Subterranean Press, 2001)
- A Sad Last Love at the Diner of the Damned (Fort Wayne, Indiana: Wormhole Books, 2001)
- While She Was Out (Denver, Colorado: Wormhole Books, 2001)
- Predators and Other Stories (Golden, Colorado: ReAnimus Press, 2014)