Studies of roof movement in coal mines.

Author: Maize, Earl R.
Additional Authors: Thomas, Edward., Greenwald, H. P.
Year: 1940
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:3506
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 3506
Subjects: Coal mines and mining
Mine roof control
Link: https://hdl.handle.net/2027/mdp.39015078491977

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