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Cutter roof failure : six case studies in the Northern Appalachian Coal Basin /
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| Main Author: | |
|---|---|
| Format: | Unknown |
| Language: | English |
| Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
[1990]
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| Series: | Information circular (United States. Bureau of Mines) ;
9266. |
| Subjects: | |
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