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Mine Safety Board decision 33 :Bureau of Mines definition of a gassy coal mine
| Year: | 1941 |
|---|---|
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7153 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7153 |
| Subject: | Coal mines and mining--Safety measures |
| Link: | https://hdl.handle.net/2027/mdp.39015078534164 |
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