Critical-load studies of a shield support
By: by Thomas M. Barczak and David E. Schwemmer.
Contributors: Schwemmer, David E.
Series: Report of investigations ;; 9141; Report of investigations (United States. Bureau of Mines) ;; 9141.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1987
Place of publication: Pittsburgh, Pa
Language: eng
Number of pages: 15
Subjects: Longwall mining.; Mine roof control.