The Manhattan Engineer District (MED), also known as the Manhattan Project, was a top-secret World War II government program to develop and deploy the world's first atomic weapons before Nazi Germany. The Manhattan Project took shape at three primary locations across the country: Hanford, Washington; Oak Ridge, Tennessee; and Los Alamos, New Mexico. The chemical company E.I. du Pont de Nemours & Company (also known as the DuPont Company) played a role by designing, building, and operating two sites (Hanford and Oak Ridge) for the mass production of plutonium and uranium. This small collection documents the DuPont Company's involvement in the World War II-era Manhattan Project, including interoffice memoranda and correspondence with the War Department concerning the DuPont Company's contributions to developing the plutonium pile at the University of Chicago; the development of the Hanford, Washington, plutonium production facility; and related works. ALL RECORDS ARE DECLASSIFIED.

Gilbert P. Church (1910-1993) was a civil engineer and the field project manager for E.I. du Pont de Nemours & Company at the Hanford Site during the Manhattan Project. His papers relate to the construction by DuPont for the United States government of the Hanford Engineer Works plutonium plant near Pasco, Washington.