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1مورد إلكتروني
المصدر: DTIC AND NTIS
الموضوعات: Nuclear bomb shelters United States., Mines and mineral resources United States., Caves United States., Tunnels United States., Abris antiatomiques États-Unis., Tunnels États-Unis., Caves., Mines and mineral resources., Nuclear bomb shelters., Tunnels., United States.
مصطلحات الفهرس: Escape, Rescue and Survival, CIVIL DEFENSE, SHELTERS, UNDERGROUND STRUCTURES, COSTS, FEASIBILITY STUDIES, DEFENSE PLANNING., Text