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Clifford D. Simak

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These Men Are Dangerous

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The Spaceman’s Van Gogh

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The Street That Wasn't There

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The Thing In The Stone

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The Trouble with Tycho

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The Visitors

The Visitors is a 1980 science fiction novel by author Clifford D. Simak. It is based on a similar story of the same name, which was published in serial form in Analog magazine.

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The Werewolf Principle

The Werewolf Principle is a 1967 science fiction novel by Clifford D. Simak. It was originally published by Putnam, with a paperback edition following from Berkley Books in 1968. A British hardcover was also released in 1967, with translations following into French, Italian, German, Portuguese, Dutch, and Lithuanian. …

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The Whistling Well

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The Worlds of Clifford Simak

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The World That Couldn't Be