- Serial Number List
- - Tractor Works
- 1911-1929: Engines and Tractors (by serial number prefix)
- - Title
- 1911-1922: Engines and Tractors (by serial number prefix)
- 1923, Dec. 20: Truck Motors
- 1925, Oct. 22: Letters used for Engines and Tractors
- - A-X
- - Y-YZ
- - AB-AS
- - AC-YC; miscellaneous
- 1929, June 1: Letters used for Engines and Tractors
- - A-Y
- - AZ-DB
- - EB-GC
- - HC-YC; miscellaneous
- 1928-1944: Tractors, Engines and Power Units (by model)
- - Title
- Serial Number Prefix Letters, undated
- Farm Tractors, 1932-1944
- Industrial Tractors
- - 10-20 and No. 20, 1928-1932
- - I-12, 1933-1940
- - O-12 and O-14, 1933-1940
- - W-12, 1933-1940
- - I-12 and O-12: Serial Letters, Mar. 13, 1934
- - I-12, O-12 and W-12: Serial Letters, Mar. 16, 1934
- - T-6, 1940-1943
- - TD-6, 1940-1944
- - T-9, 1940-1944
- - TD-9, 1940-1944
- - T-14, 1941-1944
- - T-14: Works Release Notice, Aug. 29, 1941
- - T-14 and U-14: Removal from Specifications, Mar. 3, 1948, page one
- - T-14 and U-14: Removal from Specifications, Mar. 3, 1948, page two
- - TD-14, 1940-1944
- - TD-18, 1938-1944
- - T-20, 1931-1940
- - T-35, 1937-1940
- - TD-35, 1937-1940
- - TA-40 [T-40?], 1932-1937
- - T-40, 1937-1940
- - TD-40, 1932-1940
- Power Units
- - 200, 1927-1932
- - 200, 1933-1940
- - U-2, 1939-1944
- - U-4, 1940-1944
- - U-6, 1940-1944
- - IU-6 Transmission, June 13, 1941
- - IU-6: Works Release Notice, Aug. 1, 1941
- - U-10, 1938-1943
- - P-12, 1935-1940
- - P-20 and U-7, 1937-1943
- - U-21, 1938-1944
- - P-30, 1932-1940
- - PA-40, 1934-1940
- - PA-50, 1935-1940
- - P-80, 1936-1937
- - PA-100, 1936-1944, page one
- - PA-100, 1936-1944, page two
- - PDG-40 (Power Grader Unit), 1937-1940
- - Gasoline Engine for No. 22 Harvester-Thresher, Sept. 18, 1943