“Some Notes on the subject for the benefit of our friends in the RAF”. P/b, 10x15cms. 10p. Issued by the undercarriage manufacturers committee - Dowty, Lockheed, Messier, Turner”. Notes on the varying types of undercarriage from the point of view of the pilot & groundcrews & aircraft designer. Illustrated with “Prune” type cartoons. Worn/tattyish. Stock code P12915.