Guide to geologic features affecting coal mine roof /
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| Main Author: | |
|---|---|
| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
[Arlington, Va.] :
Dept. of Labor, Mine Safety and Health Administration,
1979.
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| Series: | Informational report (United States. Mine Safety and Health Administration) ;
IR 1101. |
| Subjects: |