Unknown Guests is Clifford D. Simak's collection of alien contact stories. The author tells fascinating stories of human/alien relations both on Earth and distant planets.
Empire
The World That Couldn't Be
Hellhounds of the Cosmos
Good Night, Mr. James
Clifford D. Simak
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The Street That Wasn't There
Carl Richard Jacobi, Clifford D. Simak
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The Trouble With Tycho and Cosmic Engineers
Clifford D. Simak
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Cemetery World and Destiny Doll
Clifford D. Simak
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Where the Evil Dwells
Clifford D. Simak
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Why Call Them Back From Heaven?
Clifford D. Simak
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Ring Around the Sun
Clifford D. Simak
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The Visitors
Clifford D. Simak
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They Walked Like Men
Clifford D. Simak
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The Thing in the Stone
Clifford D. Simak
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Dusty Zebra
Clifford D. Simak
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The Shipshape Miracle
Clifford D. Simak
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