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| View Original: | 1961_Cheyenne_Mtn,_Exterior_const.jpg (1528x1941) | |||
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| Keywords: 1961 Cheyenne Mtn, Exterior const.jpg NORAD blast doors Cheyenne Mountain Colorado USAF photo URL https //www cheyennemountain af mil PD-USGov Construction of Cheyenne Mountain Complex 1961 in Colorado | ||||
