Clay Elk Sub Basin
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The Township Geology of Elk and Forest Counties
| Author | : Charles Albert Ashburner |
| Publisher | : |
| Total Pages | : 460 |
| Release | : 1885 |
| Genre | : Geology |
| ISBN | : |
Report of Progress in the Cambria and Somerset District of the Bituminous Coal-fields of Western Pennsylvania
| Author | : Franklin Platt |
| Publisher | : |
| Total Pages | : 432 |
| Release | : 1877 |
| Genre | : Coal mines and mining |
| ISBN | : |
Report of Progress 1874-1889,A-Z.
| Author | : Geological Survey of Pennsylvania |
| Publisher | : |
| Total Pages | : 436 |
| Release | : 1877 |
| Genre | : Coal |
| ISBN | : |
The Township Geology of Elk and Forest Counties and of Cameron County
| Author | : Charles Albert Ashburner |
| Publisher | : |
| Total Pages | : 450 |
| Release | : 1885 |
| Genre | : Geology |
| ISBN | : |
Abstracts of North American Geology
| Author | : Geological Survey (U.S.) |
| Publisher | : |
| Total Pages | : 908 |
| Release | : 1967 |
| Genre | : Geology |
| ISBN | : |
