Pebble in the Sky

20th-c 20th-century 333 alternate-universes alternate-worlds american american-author american-literature asimov classic empire far-future fiction foundation foundation-series french futurism golden-age hard-science-fiction hard-sf isaac-asimov literary-work military-history more novel novels rationalism sci-fi science-fiction scifi series sf sff social-criticism soft-science-fiction space-opera space-travel speculative teleportation time-travel violence york

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