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Descriptive Specification Vought-Sikorsky Model V-156 Scout-dive Bomber Airplane ...
United Aircraft Corporation. Vought-Sikorsky Aircraft Division
出版Vought-Sikorsky Aircraft, Division of United Aircraft Corporation, 1939
URLhttp://books.google.com.hk/books?id=DyN4GwAACAAJ&hl=&source=gbs_api