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Some Essential Safety Factors in Tunneling
| Author: | Harrington, D. |
|---|---|
| Year: | 1941 |
| Document Type: | N/A |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 439 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc12599/ |
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