Protector Larry Niven Protector Larry Niven · 1987 First published 12 years earlier Save Continue from here
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Songs of Distant Earth Arthur C. Clarke Songs of Distant Earth Arthur C. Clarke · 1986 First published 13 years earlier Save Continue from here
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The Sands of Mars Arthur C. Clarke The Sands of Mars Arthur C. Clarke · 1951 First published 48 years earlier Save Continue from here
Sassinak Anne McCaffrey Sassinak Anne McCaffrey, Elizabeth Moon · 1990 First published 9 years earlier Save Continue from here
Pebble in the Sky Isaac Asimov Pebble in the Sky Isaac Asimov · 1991 First published 8 years earlier Save Continue from here
Downward to the Earth Robert Silverberg Downward to the Earth Robert Silverberg · 1976 First published 23 years earlier Save Continue from here
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