Correspondence, memoranda, speeches, lectures, articles, reports, notes, analyses, orders, press clippings, photographs, and other papers relating chiefly to Hobson's naval career. Documents operations in Cuba and the Philippines during the Spanish-American War; his visits to Chinese, Japanese, and British colonial navy-yards; and the course on ship construction taught by Hobson at the United States Naval Academy. The congressional file documents Hobson's efforts on behalf of the prohibition amendment and the enlargement of the U.S. navy. Subjects include his advocacy of a permanent fleet in the Pacific and increase in the number of battleships, opposition to Franklin D. Roosevelt's expansion of the Supreme Court, and predictions of global conflict prior to both world wars; women's suffrage; sinking of the Lusitania; and industrial recovery during the Depression. Organizations represented include the Alcohol Education Society of America, Anti-saloon League of America, International Narcotic Education Association, Woman's Christian Temperance Union, and World Narcotic Defense Association. Correspondents include his wife, Grizelda Hull Hobson, and other family members, and Theodore Roosevelt.