Longwall mining methods in some mines of the Middle Western states

Author: Toenges, Albert L.
Year: 1936
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:6893
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 6893
Subject: Longwall mining--Equipment and supplies
Link: https://hdl.handle.net/2027/mdp.39015077569377

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