Abstract: Business papers of John W. Mariner and papers of his wife Mary Mariner concerning her leadership of the National League for Woman's Service in Wisconsin. The business papers relate to firms with which Mariner, a Milwaukee realtor, was associated. These included the Ontonagon and Brule River Railroad Company of Michigan, the J.J. Hof Land Company of Shawano County, Wisconsin, the Northern Colonization Company, and the Mariner and Kurtz Land Company, predecessor of the Mariner Realty Company. The National League for Woman's Service was a patriotic organization for which Mrs. Mariner served as state chairman during World War I. More than half of the collection concerns the records of this organization, which consist largely of correspondence with the national office of the league, with local chairmen, and with the Council of Defense, the Liberty Loan, and other committees with which the league cooperated.