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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. Annotation copyright Book News, Inc. Portland, Or. Product details Format Hardback | 384 pages Dimensions 158.75 x 241.3 x 31.75mm | 771.11g ...