Rare vintage CATERPILLAR NO. 12 MOTOR GRADER MANUAL, Serial Numbers 9K1-9K9999 and 7T1-7T3099, Operation and Maintenance Instructions, Caterpillar Tractor Co., USA. I believe it's from the 1950s because back page marked 4-53. Index in Brief: Lubrication Instructions/Operating Instructions/Maintenance Instructions/Attachments. Book is in very good vintage condition. S&H $4.00. Thanks for looking.