- ISFDB Record Number: 77057
- Biography: Bio:O'Brien
- Bibliographic Comments: Author:O'Brien
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- Cover: The Animal People (1967)
-
Cover: The Warriors of Terra (1970)
also appeared as:
- Variant Title: Cover: Het Slavenschip van Sergan (1975)
-
Cover: Agent of Chaos (1970)
also appeared as:
- Variant Title: Cover: Wizard of Storms (1973)
- Cover: The Moon People (1970)
- Cover: From the Land of Fear (1973)
-
Cover: The New Tomorrows (1973)
also appeared as:
- Variant Title: Cover: The Eighty Minute Hour (1975)
- Cover: Swamp Master (1992)
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