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mark a sholes
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Cilt sonuçları
Coal geology of Montana
Mark A. Sholes · Montana Bureau of Mines and Geology
157 sayfa · 1992
Mines and mineral resources / Geology / Coal
Bituminous coal resources in Western Pennsylvania
Mark A. Sholes · Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey
13 sayfa · 1974
Coal mines and mining