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Geologic and ground-control aspects of an experimental shortwall operation in the upper Ohio Valley /
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| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior,
1976.
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| Series: | Report of investigations (U.S. Department of the Interior.
8112 |
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