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| View Original: | 31_Oct_1961_Cheyenne_Mt,_Ext_const,_earthmover.jpg (1874x1488) | |||
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| Keywords: 31 Oct 1961 Cheyenne Mt, Ext const, earthmover.jpg NORAD blast doors Cheyenne Mountain Colorado USAF photo URL https //www cheyennemountain af mil PD-USGov Construction of Cheyenne Mountain Complex Road transport in Colorado 1961 in Colorado Dump trucks in the United States Off-road dump trucks October 1961 in the United States Photographs taken on 1961-10-31 | ||||
