Books about Life on other planets -- Fiction (sorted alphabetically)
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Citadel of the Green Death Robert Emmett McDowell
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Creatures That Time Forgot Ray Bradbury
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Critical difference Murray Leinster
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Cultural Exchange Keith Laumer
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Dancers Margaret St. Clair
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Deathworld Harry Harrison
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Desert and the Stars Keith Laumer
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Devolutionist and the Emancipatrix Homer Eon Flint
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Distress Signal Ross Rocklynne
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Earthman on Venus (Originally titled "The Radio Man") Ralph Milne Farley
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Earth Quarter Damon Knight
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eater of souls Henry Kuttner
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Eight Keys to Eden Mark Clifton
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Emancipatrix Homer Eon Flint
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Ethic of the Assassin Hayden Howard
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Exploration Team Murray Leinster
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Fairyland planet John Silletto
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fighting man of Mars Edgar Rice Burroughs
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fixer George O. Smith
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Flying Tuskers of K'niik-K'naak Jack Sharkey
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Fog of the Forgotten Basil Wells
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Fool David Mason
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Forever We Die! Stephen Marlowe
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Frozen Planet Keith Laumer
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Galactic Patrol E. E. Smith