Studies of roof movement in coal mines.

Additional Authors: Hartmann, Irving, Greenwald, H. P., Maize, E. R., Rice, G. S.
Year: 1937
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:3355
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 3355
Subjects: Mine roof control
Coal mines and mining--Pennsylvania
Link: https://hdl.handle.net/2027/mdp.39015078518712

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