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The Telegraph Manual
其他書名
A Complete History and Description of the Semaphoric, Electric and Magnetic Telegraphs of Europe, Asia, Africa, and America, Ancient and Modern : with Six Hundred and Twenty-five Illustrations
出版D. Van Nostrand, 1867
URLhttp://books.google.com.hk/books?id=VKBFAQAAMAAJ&hl=&source=gbs_api
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