Vintage GM CHEVROLET Medium And Heavy Duty Overhaul Manual.  Dated various years of the 70's.  From a dealership.  This is a heavy, large book.  The outer has wear.  Pages are in good vintage condition.  They show signs of use but are overall clean.  On the inside, the cover is not hooked to the metal bracket, as shown.

Please see photos for more condition details.  Thanks.