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Ringworld (original 1970; edition 1981)
by Larry Niven
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Amazon.com Product Description (ISBN 0345333926, Mass Market Paperback)A new place is being built, a world of huge dimensions, encompassing millions of miles, stronger than any planet before it. There is gravity, and with high walls and its proximity to the sun, a livable new planet that is three million times the area of the Earth can be formed. We can start again!
(retrieved from Amazon Mon, 30 Sep 2013 13:34:50 -0400)
Two humans and two aliens, who are traveling to distant reaches of space to prevent a future catastrophe, crash on a ringworld apparently created by superior technologies.
(summary from another edition)
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