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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 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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