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The Commercial Code of Signals for the Use of All Nations: Rogers' American Edition and Flags, with the British Vocabulary
Great Britain. Board of Trade
出版G.E. Eyre and W. Spottiswoode, 1859
URLhttp://books.google.com.hk/books?id=rFxOAQAAMAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN