Pierre A. Gentieu (1842-1930) was a long-term employee of E.I. du Pont de Nemours & Company who created an invaluable photographic record of the company's Brandywine Mills at the turn of the century. This is a small group of photographs related to northern New Castle County, Delaware. There are two photographs taken by Pierre and Frederic A. Gentieu, father and son, who photographed an August outing with a large group of men, women, and children.

Rockland is an unincorporated old mill village in New Castle County, Delaware, and was later surrounded by du Pont family estates. The collection contains twelve edited oral history transcripts by Mary Laird Silvia (1938-2013) with people who lived in Rockland.