Geologic factors causing roof instability and methane emission problems : the Lower Kittanning coalbed, Cambria County, Pa. / by C.M. McCulloch and Maurice Deul.
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| Format: | Government Document Book |
| Language: | English |
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[Washington, D.C.] :
U.S. Dept. of Interior, Bureau of Mines,
1973.
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| Series: | Report of investigations (United States. Bureau of Mines) ;
7769. |
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| Physical Description: | 25 pages : illustrations, maps ; 26 cm. |
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| Bibliography: | Bibliography: pages 24-25. |