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An essay on the different modes of communication by signals; containing an history of the progressive improvements in this art, from the first account of beacons to the most approved methods of telegraphic correspondence

John GAMBLE (Fellow of Pembroke College, Cambridge.)

出版	W. Miller, 1797
URL	http://books.google.com.hk/books?id=T2fWwx1tzVQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN