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| Keywords: 18 Apr 1962 Cheyenne Mt, Int const, tunnel work.jpg NORAD blast doors Cheyenne Mountain Colorado USAF photo URL https //www cheyennemountain af mil PD-USGov Construction of Cheyenne Mountain Complex Tunnels in Colorado 1962 in Colorado April 1962 in the United States 1962 in construction April 1962 photographs | ||||
