The Dimmick family were descendants of the founders of E.I. du Pont de Nemours & Company, a chemical research and manufacturing company. The collection contains a microfilm copy of correspondence between Joanna (Smith) du Pont (1815-1876) and her daughter, Joanna (du Pont) Dimmick (1854-1901), and letters from Sophie M. du Pont (1810-1888) to her niece, Dimmick, and the latter's step-daughter, Lavinia Elizabeth Dimmick (1874-1946). The letters are personal in nature, including du Pont family news.

Eugene du Pont (1840-1902) was the eldest son of Alexis I. du Pont (1816-1857) and Joanna Smith du Pont (1815-1876) and joined the E.I. du Pont de Nemours & Co., eventually rising to president in 1899. The bulk of the papers in this small collection are letters sent to Eugene du Pont by his mother while he was in school in Philadelphia from 1857 to 1859.