This collection consists of photographic and graphic materials primarily of Crowninshield's extended du Pont family and friends. The collection has been organized into four series: Family portraits, Travel photographs, Residences, and Mary Pauline Foster du Pont sketches and collection of travel souveniers.

The Family portraits series contains portraits of the Crowninshield's, her parents, brother Henry Francis du Pont, her nieces, and cousins. Henry Algernon du Pont, Louise's father, is represented with photographs from his military days to his years as an elderly man. There is a photographic copy of the sketch of him by John Singer Sargent in 1920. There are also photographs and engravings of Crowninshield's ancestors.

The Residences series is composed of images of Eleutherian Mills and its environs. These include two rare, small early sketches of a greenhouse (without attribution) and a dormer by Theophilus Chandler. Most of the holdings, however, are photographs taken of the family home. The collection also includes views of the garden that Crowninshield had built on top of the DuPont Company's industrial ruins. Some of these were taken by New York photographer Frank Geisler (1867-1935). There are also views of her other homes in Masachusetts and Florida. The homes of other du Pont family members, including Beecheville-Burgundy, the country chateau of Jacques Bidermann, and the home of Bertha King Benkard at Oyster Bay, Long Island (1945) are included. There is a fragment of a lithograph showing "Lamb Mill;" a view of Gilpin's Mill which is erroneously titled "The Battle of the Brandywine;" an engraving of Camp Du Pont, and an engraving of the Surrender Following the Battle of York.

The Travel photographs series contains some faded snapshots of her trip to Japan, Ceylon, Bangkok in 1955 and the Philippine Islands. There are photographs of trips to unidentified locations and commercial postcards collected on her visits to Italy, Istanbul, and Greece.

The Mary Pauline Foster du Pont sketches and collection of travel souveniers series are primarily items gathered in her ninteenth century European and American travels and portraits of friends. In her travels she collected photographs, cartes de visite, and cabinet cards of European scenic views, celebrities, and royalty. There are also some pencil sketches done by her in her youth, two small pencil sketches of cats labeled in French; a photographic series of the Brighton cats by H. Pointer.