Formal Case Files: Auto Transportation Companies, Interstate, 1931-1933 (Series 1277), Formal Case Files: Bonded Carriers (Truck and Bus), 1927-1933 (Series 1276), Formal Case Files: Motor Carriers, 1941-1982 (Series 1275) and Formal Case Files: Motor Vehicle Hauling, 1931-1933 (Series 1272).
