Geologic conditions affecting safe bituminous coal mining in Pennsylvania : selected papers /
| Corporate Author: | |
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| Other Authors: | |
| Format: | Book |
| Language: | English |
| Published: |
Harrisburg, Pa. :
Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey,
1979.
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| Series: | Information circular (Pennsylvania. Bureau of Topographic and Geologic Survey) ;
84. |
| Subjects: |