Preparation characteristics of coal occurring in Cambria County, Pa. / by William L. Crentz and Fern Steele.

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Main Author: Crentz, W. L. (William L.)
Other Authors: Steele, Fern
Format: Government Document Book
Language:English
Published: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1950.
Series:Report of investigations (United States. Bureau of Mines) ; 4747.
Subjects: