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The Hanford Engineer Works in Hanford, Washington, was constructed between 1943 and 1945 to create the plutonium 239 and uranium 235 used in the atomic weapons needed for World War II. Sponsored by the Army Corps of Engineers, E.I. du Pont de Nemours & Company acted as the prime contractor. This collection consists of two items: a memorandum and an organizational chart from the Construction Division of the Hanford Engineer Works.