Harold F. Pitcairn: Aviator, Inventor, and Developer of the Autogiro - Softcover

 
9780910557757: Harold F. Pitcairn: Aviator, Inventor, and Developer of the Autogiro

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9780910557733: Harold F. Pitcairn: Aviator, Inventor, and Developer of the Autogiro

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ISBN 10:  091055773X ISBN 13:  9780910557733
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