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Experiments in Underground Signalling with Radio Sets

C. L. ColburnCraig Miller BoutonH. B. Freeman (Jr.)

出版	United States Department of the Interior, Bureau of Mines, 1922
URL	http://books.google.com.hk/books?id=fesZxtTuw1sC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN