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Preliminary economics of mining a thick coal seam by dragline, shovel-truck, and scraper mining systems
| Author: | Bertoldi, Michael J. |
|---|---|
| Year: | 1977 |
| Document Type: | USBI |
| Issuing Agency: | Dept. of the Interior, Bureau of Mines : |
| SUDOC: | I 28.27:8761 |
| Series: | Information circular - Bureau of Mines ; |
| Report Number: | 8761 |
| Subjects: | Coal-mining machinery |
| Coal mines and mining--Economic aspects--United States | |
| Strip mining--Economic aspects--United States | |
| Link: | https://hdl.handle.net/2027/mdp.39015078453753 |
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