| Geologic factors causing roof instability and methane emission problems: The Lower Kittanning coalbed, Cambria County, Pa (Report of investigations / United ... Department of the Interior, Bureau of Mines) | Unknown Bindingby C. M McCulloch (Author)
| 1 Used starting at: | $8.95 |
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| | Binding: | Unknown Binding | | Publisher: | U.S. Dept. of Interior, Bureau of Mines | | Page Count: | 25 Pages | | Publication Date: | 1973 |
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