Bowl of Heaven by Gregory BenfordThe Ringworld Engineers by Larry NivenRingworld by Larry NivenRendezvous with Rama by Arthur C. ClarkeRama II by Arthur C. Clarke
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68 books — 7 voters
Rendezvous with Rama by Arthur C. ClarkeRingworld by Larry NivenBowl of Heaven by Gregory Benford
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68 books — 77 voters