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| View Original: | 21_Sep_1961_Cheyenne_Mt,_Interior_const,_excavation.jpg (1883x1470) | |||
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| Keywords: 21 Sep 1961 Cheyenne Mt, Interior const, excavation.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 1961 in Colorado September 1961 in the United States Caterpillar bulldozers Dump trucks in the United States Photographs taken on 1961-09-21 | ||||
