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Cierva Autogiros: the development of rotary wing flight (1853100404)
Airlife Publishing Ltd; First Edition (January 1, 1988),by Peter W. Brooks, Hardcover, 400 pages, Pre-owned in VERY GOOD CONDITION but NO dust cover.
Before the helicopter was the Autogiro. This study of the revolutionary development of this early rotary-wing craft by Juan de la Cierva is well written and complete. An important addition to any library of aeronautics or the history of aviation.