| Author: | Sayers, R. R. |
|---|---|
| Year: | 1932 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, |
| SUDOC: | I 28.27:6645 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6645 |
| Subject: | Mine ventilation |
| Link: | https://hdl.handle.net/2027/mdp.39015086485664 |