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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: | Mine roof control--Pennsylvania--Pittsburgh |
| Coal mines and mining--Pennsylvania--Pittsburgh | |
| Links: | no.3581-3600 1941 |
| https://hdl.handle.net/2027/mdp.39015078518019 |
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