Detailed study of 60-day nonfatal underground accidents in Pennsylvania bituminous coal mines during 1939 /
| Main Author: | |
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D. C. :
U.S. Dept of the Interior, Bureau of Mines,
1941.
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| Series: | Information circular (United States. Bureau of Mines) ;
7176. |
| Subjects: |
| Item Description: | "November 1941". |
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| Physical Description: | 36 pages : tables ; 26 cm. |