The Abbott mss., 1969-1985, consists of the files of economist Lawrence Abbott, 1902-1985, relating to his activities with the World Federalist Association.
The Adair, Lyle G. mss., 1863-1864, consists of the wartime correspondence of Seargeant Lyle G. Adair, 1843-1918, during his service with the 111th United States Colored Infantry.
The Adam mss., 1863-1930, consists of the letters and papers of French writer, literary review editor, and salon hostess Juliette (Lambert) Adam, 1836-1936.
The Adams mss., 1912-1981, consists of the letters, photographs, and writings by and about author Booth Tarkington, 1869-1946, of Indianapolis, Indiana, and Kennebunkport, Maine. The collection was compiled by Reily Gibson Adams, 1911-1982, whose first wife, Mary Stewart Haines, 1912-1975, was Tarkington's first cousin twice removed.
The Adams, R. mss., 1968-1984, collection consists of the papers of publishing firm Rex Collings Ltd. relating to the publication of several novels, primarily Watership Down (1972), by author Richard Adams, 1920-2016.
The Adomeit mss. II, 1950-1995, consists of the papers of Ruth Elizabeth Adomeit, 1910-1996, relating primarily to her collecting of miniature books and manuscripts.