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1
The economic geology of the Upper Freeport coal in the New Stanton area of Westmoreland County, Pennsylvania: a model for coal exploration
1979, Pennsylvania Geological Survey
in English
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2
The economic geology of the Upper Freeport coal in the New Stanton area of Westmoreland County, Pennsylvania: a model for coal exploration / by Mark A. Sholes, William E. Edmunds, Viktoras W. Skema
1979, Pennsylvania, Bureau of Topographic and Geologic Survey
in English
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