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What is the responsibility of the coal-mine official in the present change to and future of mechanizes mining?
| Author: | Harrington, D. |
|---|---|
| Year: | 1939 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7081 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7081. |
| Subjects: | Coal mines and mining |
| Mine safety | |
| Link: | https://hdl.handle.net/2027/mdp.39015074126015 |
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