We have 3 copies of these parts books as follows: Mack B-61T Parts Book #6175, 47370-48484 dated June, 1967. This is a modest size manual approximately 1 inch thick with 16 chapters covering the following: Engine, Fuel, Exhaust, Cooling, Electrical, Gauge Tubing, Clutch, Transmission, Propeller Shaft, Control, Rear Axle, Front Axle, Springs, Frame, Cab and Sheet Metal and Miscellaneous. The manual contains hundreds of charts, diagrams and virtually thousands of part numbers. Mack Parts Book #5431, B61T, 54150-59, dated February, 1966. Description as above. Mack Parts Book #5904, B61ST, 45349-51, dated December, 1966. Description as above. All professionally reprinted. Please specify which parts book when ordering.