This rare find yielded a bundle of Tune-Up Primers in like new condition. The Tune-Up Primer, sometimes called the Yellow Book, contains tune-up specs for American cars from 1964 to 1972. It was small enough (3=BD"x5=BD) so that old time mechanics kept it in their shirt pocket or toolbox. They are for sale at $10 each (check or PayPal) includes postage. They won't last long so order now!