Crawford H. Greenewalt (1902-1993) was an executive with the DuPont Company and president of the firm from 1948 to 1962. In 1942, when the DuPont Company agreed to participate in the Manhattan Project, Greenewalt was named chief liaison, working with the physicists at the University of Chicago Metallurgical Laboratory, including Arthur Compton (1892-1962) and Enrico Fermi (1901-1954), who were developing techniques for plutonium separation. The collection consists of eight volumes of Greenewalt's diaries, which describe the history of the Manhattan Project and the development of the United States' first atomic bombs that were used to end the Second World War. The diaries describe the technical history of the project, as well as the relationships that developed between scientists.

Frank G. Tallman (1860-1938) was an executive of E.I. du Pont de Nemours & Co. The collection includes personal and business papers of Tallman such as diaries, letter books, and correspondence files.

Sophie du Pont Ford (1871-1957) was the daughter of Victor du Pont (1828-1888) and Alice Hounsfield du Pont (1833-1904) and the wife of Bruce Ford (1873-1931). Her papers consist primarily of her diaries but also include a scrapbook with news clippings relating to the DuPont Company, an address book with family birth dates, and a book with watercolor and text entitled "Life of Branch H. Giles."