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Over 240 Free Science Fiction Books & Novels - From Obooko
Books in Science Fiction (sorted by popularity) - Project Gutenberg
Free Sci-Fi & Fantasy Books You Can Read Right Now
Amazon.com: Free Kindle Books Science Fiction
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Science fiction - Open Library
Amazon.com: Free Science Fiction Kindle Books
Books about Science fiction (sorted by popularity)
Free eBooks, Space Exploration - Fiction, Science Fiction
Books in Science Fiction (sorted alphabetically by author)