Mine Safety Board decision 30 : main fan installations at coal mines / by the Mine Safety Board.
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| Corporate Authors: | , |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of the Interior, Bureau of Mines,
1939.
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| Series: | Information circular (United States. Bureau of Mines) ;
7050. |
| Subjects: |