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Permissible Mine Equipment Approved During the Calendar Year 1950

Hilary Breton Brunot

出版	U.S. Department of the Interior, Bureau of Mines, 1951
URL	http://books.google.com.hk/books?id=hKXVQUO6bMsC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN