Novels/Collections
- Aton
- (Chthon. 1967) == Earth
- [Phthor. 1975]
- Battle Circle
- Sos the Rope. 1968
- Var the Stick. 1972
- Neq the Sword. 1975
- Of Man and Manta
- Omnivore. 1968
- Orn. 1970
- Ox. 1976
- [Macroscope. 1969]
- (The E.S.P. Worm. 1970. With Robert Margroff)
- Prostho Plus. 1973
- (Rings of Ice. 1974)
- Triple Detente. 1974 ~~ The Alien Rulers
- (Steppe. 1976)
- Cluster
- Vicinity Cluster. 1977 == Cluster
- Chaining the Lady. 1978
- Kirlian Quest. 1978
- Thousandstar. 1980
- Viscous Circle. 1982
- 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]
- (Pretender. 1979. With Frances Hall)
- Tarot
- (God of Tarot. 1979)
- (Vision of Tarot. 1980)
- (Faith of Tarot. 1980)
- Apprentice Adept
- (Split Infinity)
- (Blue Adept. 1981)
- (Juxtaposition. 1982)
- (Out of Phaze. 1988)
- (Robot Adept. 1988)
- (Unicorn Point. 1989)
- (Phaze Doubt. 1990)
- (Mute. 1981)
- Bio of a Space Tyrant
- [Refugee. 1983]
- [Mercenary. 1984]
- [Politician. 1985]
- [Executive. 1985]
- [Statesman. 1986]
- 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]
- If I Pay Thee Not in Gold. 1993. With Mercedes Lackey
Short works
Other information