Books about Human-alien encounters -- Fiction (sorted by popularity)
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The Double Spy Dan T. Moore 169 downloads
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The overlord's thumb Robert Silverberg 169 downloads
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End as a Hero Keith Laumer 168 downloads
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The Planet That Time Forgot Donald A. Wollheim 168 downloads
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Spacemen lost George O. Smith 168 downloads
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The Revolt of the Star Men Raymond Z. Gallun 168 downloads
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The Very Secret Agent Mari Wolf 167 downloads
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Attitude Hal Clement 167 downloads
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Message From Mars Clifford D. Simak 167 downloads
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Miss Tweedham's Elogarsn Robert Moore Williams 167 downloads
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The prince of space Jack Williamson 166 downloads
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A Bad Day for Vermin Keith Laumer 166 downloads
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The Test Colony Winston K. Marks 166 downloads
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Proxy Planeteers Edmond Hamilton 165 downloads
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The leaf Robert F. Young 165 downloads
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Prelude to Space Robert W. Haseltine 165 downloads
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The life watch Lester Del Rey 164 downloads
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The Inhabited Richard Wilson 164 downloads
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Battle for the Stars Edmond Hamilton 164 downloads
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The invading asteroid Manly Wade Wellman 164 downloads
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The Green World Hal Clement 163 downloads
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Colossus of Chaos Nelson S. Bond 163 downloads
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White spot Murray Leinster 163 downloads
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The Five Hells of Orion Frederik Pohl 163 downloads
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Peacemaker Alan Edward Nourse 162 downloads