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Strategies for encouraging miners to stay away from unsupported roof and perform self-protective actions /
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| Main Author: | |
|---|---|
| Format: | Unknown |
| Language: | English |
| Published: |
Pittsburgh, Pa. :
U.S. Dept. of the Interior, Bureau of Mines,
990.
|
| Series: | Information circular (United States. Bureau of Mines) ;
9283. |
| Subjects: | |
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