Notes for the Lancaster Aircraft, AVRO Type '683' MK.I, II, III & X. Published by A.V.Roe & Co. Ltd., Manchester, June 1944. Card covers, 15 x 23cm. Approximately 66p plus around 21 pullout diagram/charts at the back. Subjects covered include the fuselage, flying controls, engine and secondary controls, hydraulic system, gun turret hydraulic system, electrics, wireless equipment, bomb gear, compasses, oxygen system etc. The diagrams include the instrument panel, hydraulics, fuel system, turret hydraulics etc. Each copy was marked as 'Confidential', covered by the official secrets act and had an individual reference number, 4249 in this case. The cover is a bit grubby, creased and dog-eared at the edges. The pages and diagrams are good. Named to a Flight Engineer from London. Excellent reference material. Stock code P20570.