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Hal Clement

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Mission of Gravity is a science fiction novel by Hal Clement. The novel was serialized in Astounding Science Fiction magazine in April–July 1953. Its first hardcover book publication was in 1954, and it was first published as a paperback book in 1958. Along with the novel itself, many editions of the book also include …

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Close to Critical is a science fiction novel by Hal Clement. The novel was first serialized in three parts and published in Astounding Science Fiction magazine in 1958. Its first hardcover book publication was in July 1964.

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