Ornithological studio photographs, 1975.
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Greenewalt, Crawford H., 1902-1993
http://n2t.net/ark:/99166/w60k2bdz (person)
Crawford H. Greenewalt was an executive with the Du Pont Company and president of the firm from 1948 to 1962. He joined the company in 1922 and served as a supervisor on the nylon project in the 1930s and during the war as technical liason on the Manhattan Project. He was an accomplished amateur photographer and ornithologist and author of a study of hummingbirds (1960). After his retirement from Du Pont, Greenewalt served on a number of corporate boards, business, political, scientific, civic a...