".: 7. London, George Newnes, s.d. (ca. 1937), 3 vols in-8° & in-8° portfolio, viii + 840 pp ; iv + 796 pp ; iv + 844 pp ; portfolio with 39 data sheet of airplanes (including the Spitfire, sheet 22), uniform red cloth, the three volumes deal with ''Principles and Construction'', ''Production'' and ''Maintenance and Overhaul'' respectively. Sydney Cockerell contributes two pieces on aircraft wheel brakes.Very nice condition."