This is a good original Oliver Parts book for the OC-12 gas crawler tractors serial no. IJR000 and up-- There are around 150 pages of Detailed pictures of the parts of the Crawler tractor with part numbers and descriptions-- No loose or missing pages and no rips -- There is some light wear and soiling  -- THIS IS A ORIGINAL OLIVER MANUAL not some cheap reprint -- Printed in 1955 --  if you have any questions please ask -- take a look at my other manuals and books I will combine shipping -- thanks!