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Electrical symbols for mine maps
| Author: | Clark, H. H. |
|---|---|
| Year: | 1912 |
| Document Type: | USBM |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.7:22 |
| Series: | Technical paper / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 22 |
| Subject: | Electricity in mining--Notation |
| Link: | https://hdl.handle.net/2027/mdp.39015077560491 |
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