Correlation of coal beds in the Monongahela formation of Ohio, Pennsylvania, and West Virginia
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Correlation of coal beds in the Monongahela formation of Ohio, Pennsylvania, and West Virginia
(Bulletin / Carnegie Institute of Technology, 9)
Carnegie Institute of technology, 1923
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Note
Errata slip attached to p. [1]
Under auspices of Carnegie institute of technology, United States Bureau of mines and Advisory board of coal-mine operators and engineers