Catherine C. Irving (1884-1982) was the wife of Alexander Duer Irving (1873-1941). He was an aide to President Woodrow Wilson (1856-1924) at the Versailles peace treaty negotiations in 1919 after World War I. The letter from Irving to W.W. Laird (1910-1989), she recounts an anecdote about Col. H.A. du Pont (1838-1926).

Henry Algernon du Pont (1838-1926) was a military officer, a politician from Delaware, and vice president of E.I. du Pont de Nemours & Co. The collection consists of five letters from du Pont to Gustav Schelle (1845-1927) and one from Schelle. The letters mostly express personal friendship and deal indirectly with Schelle's writings on the Physiocraps and du Pont de Nemours.

Henry Algernon du Pont (1838-1926) was a military officer, a politician from Delaware, and vice president of E.I. du Pont de Nemours & Co. The collection contains two photocopied letters from du Pont to Daniel Ammen (1820-1898), a Naval officer and Chief of the Bureau of Navigation.

Henry Algernon du Pont (1838-1926) was a military officer, a politician from Delaware, and vice president of E.I. du Pont de Nemours & Co. The collection contains miscellaneous material related to du Pont, including a letter, Christmas cards, invitation to meet the Representatives of the Societies of the Cincinnati, and invitation from the Secretary of the Navy to the unveiling of the statue of Samuel Francis du Pont (1803-1865).