William Corbit Spruance (1873-1935) was an electrical engineer and Vice President in Charge of Production at E.I. du Pont de Nemours & Company. His wife, Alice Moore Lea Spruance (1876-1967), was a member of a Wilmington, Delaware, flour-milling dynasty. Spruance family miscellany contains threes letters, two regarding a forestry bill and one a thank you letter. Additionally, there are two copies of a newspaper article titled "This was the Civil War".

The Spruance family was a well-known family in Delaware. The family includes Senator Presley Spruance (1785-1863), Judge William C. Spruance (1831-1913), William Spruance (1873-1935), among many others. The collection includes material related to the genealogy of the Spruance family of Delaware, particularly correspondence from and to members of the Spruance family regarding their genealogy and the book compiled by William Spruance, The Spruance family in Delaware, 1733-1933.

William Spruance (1873-1935) was an electrical engineer and corporate officer in the DuPont Company. The collection contains letters about shares in the E.I. du Pont de Nemours Powder Company awarded under the company's bonus system.

At the time of his death, William G. Ramsay (1866-1916) was chief engineer, a director and vice president of E.I. du Pont de Nemours & Company. This is a small collection of photographs of executives of the DuPont Company. Most of them are copies of other photographs. All but one is identified.