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Multiple-Shift Mechanical Mining in some Bituminous-Coal Mines: Progress Report 4. Extraction of Pillars with Mechanized Equipment
| Author: | Toenges, Albert L. |
|---|---|
| Additional Authors: | Maize, Earl R. |
| Year: | 1942 |
| Document Type: | N/A |
| SUDOC: | I 28.27:7223 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | I. C. 7223 |
| Subjects: | Coal-mining machinery. |
| Bituminous coal industry -- United States. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc67021/ |
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