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Method and Cost of Mining the Thick Freeport Coal in a Second Western Pennsylvania Mine
| Author: | Paul, James Washington |
|---|---|
| Year: | 1929 |
| Document Type: | N/A |
| SUDOC: | C 22.11:6152 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | Circular No. 6152 |
| Subject: | Coal mines and mining -- Pennsylvania -- Armstrong County. |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc784354/ |
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