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A quarter century of mechanized mining:notes on permissibility
| Author: | Ilsley, L. C. |
|---|---|
| Year: | 1941 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7156 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7156. |
| Subject: | Mines and mineral resources |
| Link: | https://hdl.handle.net/2027/mdp.39015078534198 |
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