This little pocket handbook is in 'almost perfect' condition. Printed in 1981. Inside cover says AERONAUTICAL VESTPOCKET HANDBOOK. United Technologies Pratt & Whitney Aircraft. Commercial Products Division; Government Products Division; Manufacturing Division; Pratt & Whitney Aircraft of Canada, Ltd.. Also listed is PWA Part No. 79500; Nineteenth Edition - Thirty-First Printing; S-0465 August 1981; Printed in the U.S.A.