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Design of Underground Openings in Competent Rock
| Author: | Obert, Leonard |
|---|---|
| Additional Authors: | Duvall, Wilbur I. |
| Year: | 1960 |
| Document Type: | N/A |
| Issuing Agency: | United States. Bureau of Mines. |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 587 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc12741/ |
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