The Leonard J. Arrington Papers consist of personal and professional documents and research and writing files related to the work of Leonard J. Arrington, one of the premier Mormon historians in the twentieth century. The papers were donated to Utah State University's Special Collections & Archives by Leonard and Harriet Arrington in a February 1, 1994, agreement, supplemented by a December 14, 1998, agreement which created the Leonard J. Arrington Historical Archives. Subsequent donations by Leonard, Harriet, the Arrington children, the Joseph Fielding Smith Institute for Church History, and the Charles Redd Center for Western Studies have yielded additional material. Three other Arrington collections already housed by Special Collections have been incorporated into the Arrington Papers: Mss 19 (Draft of Great Basin Kingdom), Mss 82 (copies of Arrington's diaries to 1987), and Mss 87 (Draft of David Eccles: Pioneer Western Industrialist). As required by these agreements, the Arrington Papers are housed as part of the Leonard J. Arrington Historical Archives.