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Robyn Tallis
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ZERO-SUM GAMES (Planet Builders #5)

4.2  ·  Rating Details ·  10 Ratings  ·  0 Reviews
When young space adventurer Sean Matthews is brought into Ambora's medical center unconscious, his friends go to explore the scene of the accident. What they find is trouble and danger in the fifth installment of the Planet Builders series.
Mass Market Paperback, 0 pages
Published February 28th 1989 by Ivy Books
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Pseudonym for a group of authors. The first six books were overseen by Bruce Coville, who wrote the first book. Sherwood Smith oversaw the last four books (the series was originally supposed to be six, then was expanded)

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Zero-Sum Ga
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