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Coal resources of selected coal beds and zones in the northern and central Appalachian Basin.

Leslie F Ruppert

Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey 2002

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Coal and petroleum resources in the Appalachian basin : distribution, geologic framework, and geochemical character / edited by Leslie F. Ruppert and Robert T. Ryder.

Leslie F. Ruppert [editor]

Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey 2014

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