Books
- [Macroscope.] 1969
- The E.S.P. Worm. 1970, with Robert Margroff
- Prostho Plus. 1973
- Rings of Ice. 1974
- Triple Detente. 1974
- Steppe. 1976
- Pretender. 1979, with Frances Hall
- Mute. 1981
- If I Pay Thee Not in Gold. 1993, with Mercedes Lackey
- Apprentice Adept
- Split Infinity.
- Blue Adept. 1981
- Juxtaposition. 1982
- Out of Phaze. 1988
- Robot Adept. 1988
- Unicorn Point. 1989
- Phaze Doubt. 1990
- Aton
- Chthon. 1967 == Earth
- [Phthor.] 1975
- Battle Circle
- Sos the Rope. 1968
- Var the Stick. 1972
- Neq the Sword. 1975
- Bio of a Space Tyrant
- [Refugee.] 1983
- [Mercenary.] 1984
- [Politician.] 1985
- [Executive.] 1985
- [Statesman.] 1986
- Cluster
- Vicinity Cluster. 1977 == Cluster
- Chaining the Lady. 1978
- Kirlian Quest. 1978
- Thousandstar. 1980
- Viscous Circle. 1982
- Incarnations of Immortality
- On a Pale Horse. 1983
- Bearing an Hourglass. 1984
- With a Tangled Skein. 1985
- Wielding a Red Sword. 1986
- [Being a Green Mother.] 1987
- [For Love of Evil.] 1988
- [And Eternity.] 1990
- Kelvin of Rud
- [Dragon's Gold.] 1987
- [Serpent's Silver.] 1988
- [Chimaera's Copper.] 1990
- [Orc's Opal.] 1991
- [Mouvar's Magic.] 1992
- Mode
- [Virtual Mode.] 1991
- [Fractal Mode.] 1992
- [Chaos Mode.] 1993
- Of Man and Manta
- Omnivore. 1968
- Orn. 1970
- Ox. 1976
- Tarot
- God of Tarot. 1979
- Vision of Tarot. 1980
- Faith of Tarot. 1980
- Xanth
- A Spell for Chameleon. 1977
- The Source of Magic. 1979
- Castle Roogna. 1979
- Centaur Aisle. 1981
- Ogre, Ogre. 1982
- Night Mare. 1982
- Dragon on a Pedestal. 1983
- Crewel Lye. 1985
- Golem in the Gears. 1986
- [Vale of the Vole.] 1987
- Heaven Cent. 1988
- Man from Mundania. 1989
- Isle of View. 1990
- Question Quest. 1991
- [The Color of Her Panties.] 1992
- [Demons Don't Dream.] 1993
- [Harpy Time.] 1993
- [Geis of the Gargoyle.] 1994
- [Roc and a Hard Place.] 1995
- [Yon Ill Wind.] 1996
- [Faun and Games.] 1997
Short works