Books about Human-alien encounters -- Fiction (sorted alphabetically)
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Routine for a Hornet Don Berry
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Rx Alan Edward Nourse
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Satellite of Death Randall Garrett
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Satisfaction Guaranteed Joy Leache
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Savage Galahad Bryce Walton
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Scandalized Martians Arnold Marmor
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Scapegoat Richard Maples
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Secret of the Martians Paul W. Fairman
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Sentimentalists Murray Leinster
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Serpent River Don Wilcox
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Shadrach" Nelson S. Bond
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Shock Troop Richard Bolton
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Short Snorter Charles Einstein
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Sidewinders From Sirius Fox B. Holden
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Sinister Invasion Edmond Hamilton
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Slaughter on Dornell IV Randall Garrett and Robert Silverberg
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small bears Gene L. Henderson
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Snowbank Orbit Fritz Leiber
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Space brat Henry Slesar
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Spacemen lost George O. Smith
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space visitors Edmond Hamilton
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Spawning Ground Lester Del Rey
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Special Delivery Kris Neville
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Specimen Charles V. De Vet
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Spoilers of the Spaceways W. Bradford Martin