The United World Federalists mss. IV, 1927-2011, consists of books, pamphlets, and research related to the United Nations, the environment, and generalized politics, as well as copies of World Federalist Association annual reports, the World Federalist News magazine, and miscellaneous related awards and conferences materials.
The United World Federalists mss. V, 1947-1974, consists of materials from international conferences, various publications, and individuals associated with the organization, including Garry Davis and Charles Heywood.