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
Format: Microform
Number of pages: 15
Subjects: Longwall mining; Mine roof control
Notes: Microfiche. Washington, D.C. : U.S. G.P.O. 1991. 1 microfiches : negative.