Two-leg longwall shield mechanics
By: by Thomas M. Barczak and David E. Schwemmer.
Contributors: Schwemmer, David E.
Series: Report of ivestigations / United States Department of the Interior, Bureau of Mines ;; 9220; Report of investigations (United States. Bureau of Mines) ;; 9220.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1989
Place of publication: Pittsburgh, PA
Language: eng
Number of pages: 34
Subjects: Mine roof control.; Longwall mining.
Notes: Includes bibiographical references.