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Mechanical Mining in Some Bituminous-Coal Mines: Progress Report 6. Extraction of Pillars with Mechanized Equipment
| Author: | Haley, Wilbur A. |
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| Additional Authors: | Toenges, Albert L., Shields, Joseph J. |
| Year: | 1952 |
| Document Type: | N/A |
| SUDOC: | I 28.27:7631 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | I. C. 7631 |
| Subjects: | Bituminous coal industry -- United States. |
| Coal-mining machinery. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc67061/ |
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