- (1976) Novel: "There Will Be Time".
- (1984) Novel: "Three Hearts and Three Lions".
- (1991) Novel: "The Time Patrol".
- (1983) Novel: "Trouble Twisters".
- (1978) Novel: "Two Worlds".
- (2000) Novel: "Virgin Planet".
- (1997) Novel: "War of the Gods".
- (1976) Novel: "War of the Wing Men".
- (1995) Novel: "The Winter of the World".
- (1988) Novel: "The Year of the Ransom".
- (1978) Novel: "Queen of Air and Darkness".
- (1969) Novel: "Rebel Worlds".
- (1991) Novel: "The Shield of Time".
- (1998) Novel: "Starfarers".
- (1994) Novel: "The Stars Are Also Fire".
- (1985) Novel: "Starship".
- (1980) Novel: "A Stone in Heaven".
- (1978) Novel: "Orbit Unlimited".
- (1999) Novel: "Operation Luna".
- (1995) Novel: "Operation Chaos".
- (1977) Novel: "Mirkheim".
- (2001) Novel: "Mother of Kings".
- (1978) Novel: "The Night Face and Other Stories".
- (1978) Novel: "Long Way Home".
- (1980) Novel: "Merman's Children".
- (1985) Novel: "The Long Night".
- (1979) Novel: "A Knight of Ghosts and Shadows".
- (1993) Novel: "Kinship with the Stars".
- (1990) Novel: "Inconstant Star".
- (1996) Novel (w/Karen Anderson): "The King of YS".
- (1976) Novel: "Homeward and Beyond".
- (2000) Novel (w/Gordon R. Dickson): "Hokas Pokas!".
- (1998) Novel (w/Gordon R. Dickson): "Hoka! Hoka! Hoka!".
- (1993) Novel: "Harvest of Stars".
- (1995) Novel: "Harvest the Fire".
- (1981) Novel: "The Guardians of Time".
- (2000) Novel: "Genesis".
- (1994) Novel: "The Game of Empire".
- (1997) Novel: "The Fleet of Stars".
- (1979) Novel: "Flandry of Terra".
- (1980) Novel: "The Enemy Stars".
- (1988) Novel: "Fire Time".
- (1983) Novel: "The Earth Book of Stormgate".
- (1978) Novel: "The Day of Their Return".
- (1981) Novel: "Dark Between the Stars".
- (2001) Novel: "Conan the Rebel".
- (1992) Novel; "Conflict".
- (1981) Novel: "Corridors of Time".
- (1970) Novel: "Circus of Hells".
- (1978) Novel: "The Byworlder".
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