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Books about Life on other planets (sorted by popularity)
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https://sendtokindle.compellingsciencefiction.com/ebooks/35937.opds
Are the Planets Inhabited?
E. Walter Maunder
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https://sendtokindle.compellingsciencefiction.com/ebooks/7781.opds
La Vita Sul Pianeta Marte (Italian)
G. V. Schiaparelli