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Geologic investigations of underground coal mining problems /
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| Main Author: | |
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| Corporate Author: | |
| Other Authors: | , |
| Format: | Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of the Interior,
[1975]
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| Series: | Report of investigations (U.S. Department of the Interior.
8022 |
| Subjects: | |
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