Correspondence, business records, financial records, legal documents, speeches, reports, essays, memoranda, and other papers of members of the Galloway, Maxcy (Maxey), and Markoe families relating to economic conditions in Maryland and foreign affairs and political events in the 1840s and 1850s.

Diplomat, publicist, civic leader, and peace advocate. Scrapbooks and correspondence relating to Marburg's civic activities in Baltimore, Maryland, his belief in internationalism and advocacy for peace before and after World War I, his role as United States minister to Belgium from 1912 to 1914, and his work as an art collector and public art advocate.

Photographer, journalist, radio broadcaster, cinematographer, diplomat's spouse, and philanthropist. Correspondence, memoranda, diaries, family papers, photographs, subject files, notebooks and albums, clippings, printed matter and other material documenting Patterson's early life and family history, her career, her activities while accompanying her husband to various diplomatic postings, her activism with various clubs and organizations, and her philanthropy.

Diplomat. Correspondence, family papers, topical files, photographs, scrapbooks, printed matter, and miscellaneous material relating to Simpson's career as a diplomat and industrial relations specialist.