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First National Mine-Safety Demonstration, Pittsburgh, PA., October 30 and 31, 1911
| Author: | Wilson, Herbert M. |
|---|---|
| Year: | 1912 |
| Document Type: | N/A |
| SUDOC: | TN 23 U4 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | USBM Bulletin 44 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc70467/ |
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