Falls of roof in mines operating in the Pittsburgh Coal Bed, West Virginia / by J.W. Paul and J.N. Geyer.
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington :
U.S. Govt. Print. Off,
1933.
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| Series: | Technical paper (United States. Bureau of Mines) ;
547. |
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| Item Description: | At head of title: U.S. Department of Commerce. Roy D. Chapin, secretary. Bureau of Mines. Scott Turner, director. |
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| Physical Description: | ii, 23 pages : including illustrations, map, tables ; 23 cm. |