Douglas Helms collection, 1930?-2011
1970-2000
Helms, Douglas
The Douglas Helms Collection contains articles, books, reports, correspondence, photographs, films, oral histories, speeches, and research materials related to the history of the U.S. Department of Agriculture (USDA) Soil Conservation Service, and its successor agency, the Natural Resources Conservation Service.
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Información bibliográfica
Este registro bibliográfico ha sido proporcionado por National Agricultural Library