Series III - Subject files, consists of twenty-one alphabetical headings. Two subjects account for half of the series, and are also the most significant, "Atomic energy" and "United States government" (described at length in Scope and Content notes). Correspondents under "Atomic energy" include Commission chairmen Gordon Dean, David Lilienthal, John McCone, Glenn Seaborg, Lewis L. Strauss, and Robert E. Wilson, as well as many congressional leaders and scientists. Topics include peacetime adaptation of the Hanford facilities by the General Electric Company and (mainly) the new Savannah River plant for manufacturing the hydrogen bomb and for research into peacetime uses; also memoirs in progress by Arthur Holly Compton and General Leslie R. Groves, regarding the original Chicago experiments and development of the early atomic bomb. The "United States government" files contain further correspondence relating to atomic energy, but also deal with a number of additional topics, mainly economy-related. A sizeable amount of material in this file was generated by the government's call for managerial skills and insights from industry, by Greenewalt' s consequent participation in advisory committees and congressional hearings, and in the loan of many DuPont executives to the federal government. The remaining nineteen subject files are of relatively small quantity. A "Competitors" file contains dialogue with a variety of other leading corporation officials; and the files on "Growth of DuPont" and "History of Du Pont" contain information gathered for l50th anniversary celebrations. A final small file of "Topics" (following "U.S. government") contains further government-related miscellany. Arrangement is chronological within the subject headings.