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Photographer Edward J. Steichen (1879—1973) made significant advancements to the field of aerial photography during World War I as Chief of the Photographic Section of the United States Army's American Expeditionary Forces (AEF). This collection contains original material from the AEF Photographic Section in World War I including brief unit histories, technical information on all aspects of aerial photography and photography interpretation operations used in the field, including information on cameras and film processing, two sets of an AEF-produced portfolio of photographic prints with interpretation drawings, and sets of photographic prints assembled by Edward J. Steichen to highlight the work of the AEF Photographic Section.