The Smoke Ring (The State #3) by Larry Niven PB 1st Del Rey | eBay
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Ringworld (Ringworld, #1) by Larry Niven
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Ringworld' by Larry Niven, 1970. Cover art by Dean Ellis. : r/CoolSciFiCovers
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Ringworld by Larry Niven (Ringworld #1)
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Ringworld - Wikipedia
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Mega Structures - (4) MEGASTRUCTURES CATEGORY: STELLAR SCALE ALTERNATE NAMES / SIMILAR STRUCTURES: NIVEN RING Ringworld is an artificial ring in space large enough to maintain an atmosphere and habitable land. The
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