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Summary of drifting and crosscutting cost data
| Author: | Jackson, Charles Freeman, |
|---|---|
| Year: | 1935 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:6825 |
| Series: | Information circular / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 6825 |
| Link: | https://hdl.handle.net/2027/mdp.39015077568874 |
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