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Sampling deep ore deposits by rotary drilling and methods of surveying and controlling the direction of drill holes
| Author: | Trengove, Russell R. |
|---|---|
| Additional Authors: | Johnson, A. C. |
| Year: | 1956 |
| Document Type: | USBI |
| Issuing Agency: | Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7768 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 7768 |
| Subject: | Rotary drilling |
| Link: | https://hdl.handle.net/2027/mdp.39015078515437 |
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