A collection of instruction and maintenance manuals including The Hobson Injection Carburetter; Boeing B-17C; Armstrong Siddeley Cheetah engines; Smith's instruments; Hermes IV; Handley Page H.P.81; Vickers Viking Mk IA, I and IB pilots notes and manual; Bristol Hercules 630 series engines; Bristol Proteus series engine; Bristol Britannia; Rolls-Royce Type M.H. power plant; and others of similar interest(a lot)