Original 1941 Mack Tractor-Truck Model NJU-1 and NJU-2 Parts and Price List. This Parts Book was used by the War Department and the United States Army to order Factory Replacement Parts for these 6 Ton Cab Over Engine Truck Models. It has Parts Numbers, Descriptions and illustrations for these Parts. The back has an Alphabetical, Numerical and Pricing Index. This very rare Mack Truck and Military Book is in good condition with minor wear and soiling [see photos]. Parts List #1189, TM 10-1704, dated June 1941.