Papers of Stolberg include correspondence files, notes and manuscripts of his writings, and files of clippings and periodicals in which his articles appeared. His writings deal with the labor movement, economics, the Socialist Party, and other liberal causes of the period between the wars. The extensive correspondence in the collection includes letters from Lewis Corey, Herbert Hoover, Sinclair Lewis, H.L. Mencken, Ayn Rand, Norman Thomas, and Leon Trotsky.