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Selected geologic factors affecting mining of the Pittsburgh coalbed /
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| Corporate Author: | |
|---|---|
| Other Authors: | |
| Format: | Unknown |
| Language: | English |
| Published: |
[Washington] :
U.S. Dept. of the Interior, Bureau of Mines,
[1975].
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| Series: | Report of investigations (United States. Bureau of Mines) ;
8093 |
| Subjects: | |
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