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| View Original: | 21_Mar_1962_Cheyenne_Mt,_Ext_const,_earthmovers.jpg (1883x1500) | |||
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| Keywords: 21 Mar 1962 Cheyenne Mt, Ext const, earthmovers.jpg NORAD blast doors Cheyenne Mountain Colorado USAF photo URL https //www cheyennemountain af mil PD-USGov Construction of Cheyenne Mountain Complex 1962 in Colorado | ||||
