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Timbering along the robbing line :factors influencing falls of roof in coal mines
| Author: | Paul, J. W. |
|---|---|
| Year: | 1927 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, |
| SUDOC: | C 22.11:6042 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6042 |
| Subjects: | Mine timbering |
| Coal mines and mining--Safety measures | |
| Link: | https://hdl.handle.net/2027/mdp.39015086471433 |
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