Photographic interpretation keys : underground installations : United States. Department of the Air Force : Free Download, Borrow, and Streaming : Internet Archive

114 pages: illustrations; 26 x 37 cm; At head of title: Intelligence; 1 May 1954; NAVAER 10-35-608; Includes 2 plates (26 x 88 cm, folded to 26 x 33 cm);

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