 | Charles G. Cunningham, Denis E. Marchand, Harold J. Prostka, James George Evans, John Calvin Reed, Thomas August Steven, Alan Allwardt, J. C. Antweiler, Robert Sumner Sigafoos, Carl L. Bieniewski, George Wescott Fisher - 1980 - 408 sivua
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 | 1949 - 378 sivua
The geology and fuel resources of a part of the Powder River Basin. | |
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