 The experiments of this time period produced methods of aerial mapping that opened up vast areas which would have been denied to a ground surveyor during World War II.This collection contains bibliographies, correspondence, reports, articles, pamphlets and drafts of papers on aerial mapping and photography (one authored by Maj. James Bagley).It also contains a dictionary of photographic terms (in German) and material on various cameras and other equipment including Adam Hilger Ltd.'s Survey Stereoscope; Fairchild's Solar Navigator; Brigg's Gyroscope Vertical Indicator; J.G.