Safety evaluations of longwall roof supports
By: by Thomas M. Barczak.
Series: Information circular ;; 9221; Information circular (United States. Bureau of Mines) ;; 9221.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1989
Place of publication: Washington, DC
Language: eng
Number of pages: 17
Subjects: Mine roof control -- Evaluation.; Longwall mining.
Notes: Bibliography: p. 17.