The collection contains material related to the restoration of the Eleutherian Mills residence prior to being occupied by Louise du Pont Crowninshield (1877-1958). Material includes blueprints of surrounding land, repairs to the house, taxes, bills for labor, scenic wallpaper (A.L. Diamont & Co., Philadelphia), description of old trees, and others. The main correspondent to H.A. du Pont (1838-1926) is John W. Barnes, builder and engineer. Most of the correspondence is to and from H.A. du Pont, with a few to Louise Crowninshield.

Also included is material related to the construction of a road to the Eleutherian Mills and Nemours residences, repairs to the iron bridge over the Brandywine, correspondence and accounts with John W. Barnes about repairs to Eleutherian Mills, and a description of Eleuthère Irénée du Pont's (1771-1834) garden at Eleutherian Mills by Victorine (du Pont) Foster (1849-1934).