Geology of the Otter Creek Quadrangle Montana: Issue 1111
Arthur James Boucot · J. R. Williams · James Morton Schopf · Roger Burnham Colton · Troy Lewis Péwé · Willis Howard Nelson · Robert A. Gulbrandsen · Joseph P. Dobell · Russell A. Paige · William Albert Oliver
1949年1月 · U.S. Government Printing Office
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Information required in describing coal beds, with a discussion of sampling methods and applications for coal geology.