Clifford D. Simak

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These Men Are Dangerous

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They Walked Like Men

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Three In One - Sturgeon, Simak,Leinster

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Time and Again (Collier Nucleus Science Fiction)

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Trilobite, dinosaur, and man;: The earth's story

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Unternehmen Papst

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Welt der Puppen

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Works of Clifford Simak (5 stories)

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Worlds Without End