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Rock-dusting a Pennsylvania coal mine
| Author: | Owings, C. W. |
|---|---|
| Year: | 1931 |
| Document Type: | BMRA |
| Issuing Agency: | United States Bureau of Mines, |
| SUDOC: | C 22.12:3060 |
| Series: | Report of investigations / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 3060 |
| Subject: | Mineral dust--Pennsylvania |
| Link: | https://hdl.handle.net/2027/mdp.39015077566993 |
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