Your subscription to the 2020 Diesel Truck Index includes the current available data book plus any updates for a 12 month period from the date of purchase. Diesel Truck Index Covers: Autocar, Chevrolet, Dodge, Ford, Freightliner, GMC, International, Kenworth, Mack, Peterbilt, Volvo, Western Star models PLUS... special sections on Engines, Rear Axles, and Transmissions. Quanity Discount: 5-9 subs. $41 each, 10-19 subs. $38 each, and >20 subs. $36 each. Book Size: 5-1/4" x 8-1/2" Weight: Approx. 13 oz