| Title | Year | Series | Note |
| The Coming of the Horseclans | 1975 | Horseclans | 2006 EPPIE Award |
| Swords of the Horseclans | 1976 | Horseclans | |
| Revenge of the Horseclans | 1977 | Horseclans | |
| A Cat of Silvery Hue | 1979 | Horseclans | |
| The Savage Mountains | 1979 | Horseclans | |
| The Patrimony | 1980 | Horseclans | |
| Castaways in Time | 1980 | Castaways in Time | |
| Horseclans Odyssey | 1981 | Horseclans | |
| The Death of a Legend | 1981 | Horseclans | |
| The Witch Goddess | 1982 | Horseclans | |
| Bili the Axe | 1982 | Horseclans | |
| Champion of the Last Battle | 1983 | Horseclans | |
| A Woman of the Horseclans | 1983 | Horseclans | |
| The Seven Magical Jewels of Ireland | 1984 | Castaways in Time | |
| Shaggy Vengeance | 1984 | ||
| Horses of the North | 1985 | Horseclans | |
| Magic in Ithkar | 1985 | Magic in Ithkar | |
| Magic in Ithkar 2 | 1985 | Magic in Ithkar | |
| A Treasury of American Horror Stories | 1985 | ||
| A Man Called Milo Morai | 1986 | Horseclans | |
| The Memories of Milo Morai | 1986 | Horseclans | |
| Of Kings and Quests | 1986 | Castaways in Time | |
| Barbarians | 1986 | ||
| Trumpets of War | 1987 | Horseclans | |
| Madman's Army | 1987 | Horseclans | |
| Of Chiefs and Champions | 1987 | Castaways in Time | |
| Magic in Ithkar 3 | 1987 | Magic in Ithkar | |
| Magic in Ithkar 4 | 1987 | Magic in Ithkar | |
| Barbarians II | 1987 | ||
| Friends of the Horseclans | 1987 | ||
| Robert Adams' Book of Alternate Worlds | 1987 | ||
| The Clan of the Cats | 1988 | Horseclans | |
| Of Myths and Monsters | 1988 | Castaways in Time | |
| The Stairway to Forever | 1988 | Stairway to Forever | |
| Monsters and Magicians | 1988 | Stairway to Forever | |
| Guideposts to Danger | 1988 | Stairway to Forever | |
| Hunger for Horror | 1988 | ||
| Robert Adams' Book of Soldiers | 1988 | ||
| Of Beginnings and Endings | 1989 | Castaways in Time | |
| Friends of the Horseclans II | 1989 | ||
| Alternatives | 1989 | ||
| Phantom Regiments | 1990 |