Effect of changes in moisture and temperature on mine roof.

Author: Hartmann, Irving.
Additional Authors: Greenwald, H. P.
Year: 1941
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:3588
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 3588
Subjects: Coal mines and mining--Pennsylvania--Pittsburgh
Mine roof control--Pennsylvania--Pittsburgh
Links: https://hdl.handle.net/2027/mdp.39015078518019
no.3581-3600 1941

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