The Langley-Manby-Balzer Aero Engine of 1901 / Robert B. Meyer Jr., 1964. [5 vols., ts. Meyer at the time was acting head of the Flight Propulsion Division, National Air Museum, Washington, D.C. His 'Langley's aero engine of 1903' was published as Smithsonian Annals of Flight no.6 in 1971]