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Roof control strategies for underground coal mines /
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| Corporate Author: | |
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| Other Authors: | |
| Format: | Book |
| Language: | English |
| Published: |
Avondale, Md. :
U.S. Dept. of the Interior, Bureau of Mines,
1993.
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| Series: | Information circular ;
9351 |
| Subjects: | |
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| Physical Description: | 17 p. : ill. |
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