Original 1966-72 Chevrolet Truck Dealer Parts Catalog. This Parts Book covers the Heavy Duty Series 70000 & 80000 Truck Models. It is dated Effective March, 1972. This is what the Dealer used to Order Factory Replacement Parts to Repair your Truck. It has Part Numbers, Group Numbers, Description, Quantity, Application and Illustrations. It is in good condition with normal wear and blemishing from use in a Dealership [see photos]. Very rare and useful tool for the Truck Owner.