Advanced guidelines for performance testing of two-legged longwall shields
By: by Thomas M. Barczak.
Series: Information circular ;; 9231; Information circular (United States. Bureau of Mines) ;; 9231.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1989
Place of publication: [Avondale, Md.]
Language: eng
Number of pages: 149
Subjects: Ground control (Mining) -- Testing -- Standards.; Longwall mining -- Standards.
Notes: Bibliography: p. 28.