High angle mining system.

Bibliographic Details
Main Author:	Christofferson, Donald
Corporate Authors:	ESD Corporation, United States. Bureau of Mines. Branch of Procurement
Format:	Government Document Microform Book
Language:	English
Published:	Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, [1983]
Series:	Mining research contract report. Open file report (United States. Bureau of Mines) ; 91-40.
Subjects:	Coal-mining machinery > Technological innovations. Strip mining > Technological innovations > United States. Coal augers > Technological innovations. Buckets (Excavating machinery) > Technological innovations.