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short stories - How do the roads in "The Roads Must Roll" work? - Science Fiction & Fantasy Stack Exchange
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Amazon.com: X Minus One: The Roads Must Roll (January 4, 1956) (Audible Audio Edition): Robert A. Heinlein, Fred Collins, Ernest Kinoy - adaptation, BN Publishing: Books
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Amazon.com: X Minus One: The Roads Must Roll (Dramatized) (Audible Audio Edition): Robert Heinlein, Radio Spirits, Inc.: Books
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