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Approved Explosion-proof Coal-cutting Equipment

Horace Wadsworth GillettLee Clyde IlsleyVannoy Hartrog ManningUnited States. Bureau of Mines. Committee on Quarying and Metalliferous Mining LawErnest J. GleimWalter Renton IngallsJames DouglasJames Ralph FinlayJohn Parke ChanningJohn Hays Hammond

出版	U.S. Government Printing Office, 1914
URL	http://books.google.com.hk/books?id=umU6AQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN