1972 Chevrolet Dealer Technical Service Bulleting set numbered from 1-37. I'm guessing this is not a complete set, but, this is a guess on my part, all I have is what is included, 37 bulletins. Technical Service Bulletins were issued after the service manuals were printed and alerted dealer mechanics about new procedures, problems and repairs. Some of the topics include; Skyroof Water Seal 72 Nova; Rear Axle Noise on 71-2 Vega; Oil Filler Plug Pops Out - 72 Trucks with 350 4BBL engines; Engine Wiring Harness Failure- Chevelle, Camaro & Nova with V8 engine; Loss Of Radio Reception, 71 and early 72 Nova, and more.