Correspondence, diaries, sermons, notebooks, autobiographical papers, poems, prayers, financial papers, pamphlets, periodicals, photographss, clippings, scrapbooks, and memorabilia. Correspondence forms the bulk of the collection and relates to Johnston's career as an Episcopal clergyman in the U.S. and the Philippines, worker for the Young Men's Christian Association during World War I, director of the People's Legislative Service, director of the National Citizens Committee on Relations with Latin America, Inc., and assistant to the Rural Electrification Administrator. Correspondents include Bishops James Steptoe Johnston and Charles H. Brent, Senators Burton K. Wheeler and George W. Norris.