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Development of a Successful Hard-surfaced Bit for Drilling Oil Shale

Tell ErtlJohn R. WagnerErnest E. Burgh

出版	U.S. Department of the Interior, Bureau of Mines, 1948
URL	http://books.google.com.hk/books?id=-N0QY3BCF38C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN