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Systematic timbering rules at the Washington coal mines
| Author: | Ash, S. H. |
|---|---|
| Year: | 1930 |
| Document Type: | MAIN |
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, |
| SUDOC: | C 22.11:6316 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6316 |
| Subjects: | Coal mines and mining--Washington (State) |
| Mine timbering--Washington (State) | |
| Link: | https://hdl.handle.net/2027/mdp.39015095084375 |
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