The collection contains correspondence, legal papers, speeches, and other materials concerning Markham's political interests, although few of these papers pertain directly to the activities of the offices that he held, nor to his interest in the Horicon Marsh. The papers of W.H. Markham and Co., an investment company that he attempted to form in 1934, include organizational papers and some correspondence. Much of the collection concerns various farmers' rights organizations including the correspondence and platform papers of the Wisconsin Farm-Labor Party, 1934-1935, the legal papers of Milk Strike cases handled by Markham, 1933-1934, and the organizational papers, correspondence, and news releases of the American Farmers Foundation and its finance committee, 1939. Also included are correspondence, speeches, legal papers, and campaign literature from Markham's bid for Dodge County judge in 1939, as well as financial and campaign materials of the William H. Dietrich for Attorney General campaign, which Markham managed in 1946-1947. Correspondence concerning William Markham's brother, John Markham, and his aspirations for a political appointment in 1946, is also included.
