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Igor Sikorsky Letter to John Hays Hammond, Jr., Dated Sikorsky Aircraft, Bridgeport 1, Connecticut, 27 November 1953

Igor Ivan Sikorsky

出版	1953
URL	http://books.google.com.hk/books?id=blJSwAEACAAJ&hl=&source=gbs_api

註釋

Letter to Hammond discussing the possible military applications of helicopters.