United States president, secretary of state, and representative and senator from Pennsylvania. Correspondence, his 1858 State of the Union message, and miscellaneous items pertaining primarily to Buchanan’s career before his election as president. Also correspondence of Harriet Lane Johnston, Buchanan’s niece and White House hostess.

Financier, United States secretary of war, United States senator from Pennsylvania, and diplomat. Correspondence, diary, account books, notebooks, speeches, business and legal records, and printed material primarily relating to Pennsylvania and national politics and to Cameron's business enterprises.

U. S. secretary of labor and senator from Pennsylvania. Correspondence, diaries, speeches and writings, investgation files, financial papers, scrapbooks, photographs, and printed matter relating to Davis's service as secretary of labor in three Republican presidential administrations, his tenure as senator from Pennsylvania, and as organizer and leader of the Loyal Order of Moose.

U.S. secretary of state, U.S. senator from Pennsylvania, and lawyer. Correspondence, memoranda, speeches, writings, reports, articles, notebooks, bills and resolutions, legal records, biographical sketches, library catalog, clippings, printed matter, scrapbooks, cartoons, and other papers relating chiefly to Knox's service as U.S. attorney general, secretary of state, and senator from Pennsylvania.

United States senator from Pennsylvania, lawyer, and jurist. Three volumes (later published) of a journal kept by MacLay as a senator in the first United States Congress and one note to John Nicholson.

United States senator from Pennsylvania (1887-1904). Correspondence, election materials, financial papers, genealogical information, newspaper clippings, photographs, and other papers pertaining primarily to Quay's career in Pennsylvania and national politics as a member of the Republican party and the United States Senate.