Timbering along the robbing line :factors influencing falls of roof in coal mines

Author: Paul, J. W.
Year: 1927
Document Type: USBI
Issuing Agency: U.S. Dept. of Commerce, Bureau of Mines,
SUDOC: C 22.11:6042
Series: Information circular / Bureau of Mines ;
Report Number: 6042
Subjects: Coal mines and mining--Safety measures
Mine timbering
Link: https://hdl.handle.net/2027/mdp.39015086471433

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