Advanced guidelines for performance testing of two-legged longwall shields

Author: Barczak, Thomas M.
Year: 1989
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:
Series: Information circular / Bureau of Mines ;
Report Number: 9231
Subjects: Longwall mining--Standards
Ground control (Mining)--Testing--Standards
Link: https://hdl.handle.net/2027/mdp.39015078457655

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