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Books about Extraterrestrial beings -- Juvenile fiction (sorted by popularity)
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Tom Swift and the Visitor From Planet X
II Victor Appleton
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https://sendtokindle.compellingsciencefiction.com/ebooks/17985.opds
Tom Swift and The Visitor from Planet X
II Victor Appleton
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https://sendtokindle.compellingsciencefiction.com/ebooks/50702.opds
Venus Boy
Lee Sutton