Books about Human-alien encounters -- Fiction (sorted alphabetically)
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Cosmic Saboteur Frank M. Robinson
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Cosmic striptease Harlan Ellison
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Cosmic Tragedy Thomas S. Gardiner
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Course of Logic Lester Del Rey
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Crisis! C. M. Kornbluth
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Crisis on Titan James R. Adams
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Crowded Colony Jerome Bixby
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Cry from a Far Planet Tom Godwin
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Crystal Circe Henry Kuttner
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Cultural Exchange Jesse F. Bone
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Customs Lounge Annie Proulx
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Dancers Margaret St. Clair
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Dark Goddess Richard S. Shaver
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Dawningsburgh Wallace West
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Day of Wrath Bjarne Kirchhoff
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Definition Damon Knight
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Destination—Death Wilbur S. Peacock
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Diplomatic Immunity Robert Sheckley
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Don't Panic! Robert W. Krepps
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Doorstep Keith Laumer
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Double Spy Dan T. Moore
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Do Unto Others Mark Clifton
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Dumbwaiter James Stamers
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Earth Alert! Kris Neville
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Earthmen Ask No Quarter! Fox B. Holden