Ringworld
Larry Niven
Winner
Nebula Award for Best Novel 1970
For books published in 1970; awarded in 1971.
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And Chaos Died
Joanna Russ
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Fourth Mansions
R. A. Lafferty
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The Steel Crocodile
David G. Compton
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The Year of the Quiet Sun
Wilson Tucker
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Tower of Glass
Robert Silverberg