Abstract: Records of the International Harvester Company's 1931 centennial celebration of McCormick's invention of the reaper, consisting of correspondence, committee reports, clippings, and photographs. Correspondence is chiefly that of members of the McCormick family, officials of International Harvester, Herbert A. Kellar of the McCormick Historical Association, planning committees, and representatives responsible for managing and reporting on the event in the United States and abroad. Hundreds of clippings, mounted and unmounted, deal with advance publicity, scholarship awards, and coverage of celebration activities in practically every state and many foreign countries. Five volumes of photographs picture the development of McCormick harvesting machines and events commemorating the centennial, including special observances at Washington and Lee University and Virginia Polytechnic Institute.