Falls of roof : the no. 1 killer in bituminous-coal mines /
| Main Author: | |
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| Other Authors: | , |
| Format: | Government Document Book |
| Language: | English |
| Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
[1951]
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| Series: | Information circular (United States. Bureau of Mines)
7605 |
| Subjects: |