Cutter roof failure : six case studies in the Northern Appalachian Coal Basin /
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| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
[Washington, D.C.] (2401 E St., N.W., Washington 20241) :
U.S. Dept. of the Interior, Bureau of Mines,
[1990]
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| Series: | Information circular (United States. Bureau of Mines)
9266 |
| Subjects: |