Examination of design and operation practices for longwall shields
By: by Thomas M. Barczak.
Series: Information circular ;; 9320; Information circular (United States. Bureau of Mines) ;; 9320.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1992
Place of publication: Washington, D.C
Language: eng
Number of pages: 14
Subjects: Mine roof control.; Longwall mining.
Notes: Includes bibliographical references (p. 14).