 |
|
Mechanical Mining in Some Bituminous-Coal Mines: Progress Report 6. Extraction of Pillars with Mechanized Equipment
| Author: | Haley, Wilbur A. |
|---|---|
| Additional Authors: | Shields, Joseph J., Toenges, Albert L. |
| 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: | Coal-mining machinery. |
| Bituminous coal industry -- United States. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc67061/ |
Search developed and maintained by the University of Washington Libraries
Copyright 2010