Series
Incorporated Knight (with L Sprague de Camp)
The Incorporated Knight (1987)
The Pixilated Peeress (1991)
The Incorporated Knight (1987)
The Pixilated Peeress (1991)
Novels
The Day of the Dinosaur (1968) (with L Sprague de Camp)
Citadels of Mystery (1972) (with L Sprague de Camp)
The Stones of Nomuru (1989) (with L Sprague de Camp)
The Swords of Zinjaban (1991) (with L Sprague de Camp)
Citadels of Mystery (1972) (with L Sprague de Camp)
The Stones of Nomuru (1989) (with L Sprague de Camp)
The Swords of Zinjaban (1991) (with L Sprague de Camp)
Collections
Anthologies edited
3000 Years of Fantasy and Science Fiction (1972) (with L Sprague de Camp)
Tales Beyond Time (1973) (with L Sprague de Camp)
Creatures of the Cosmos (1977)
Tales Beyond Time (1973) (with L Sprague de Camp)
Creatures of the Cosmos (1977)
Non fiction
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