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Economic benefits of systematic roof bolting in Ziegler No. 3 Mine, Bell & Zoller Coal & Mining Co., Williamson County, Ill.,
| Author: | Kelly, L. W. |
|---|---|
| Year: | 1952 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7633 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 7633 |
| Subjects: | Mine accidents--Illinois |
| Mine roof bolting | |
| Coal mines and mining--Safety measures | |
| Link: | https://hdl.handle.net/2027/mdp.39015078455808 |
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