Map Showing Generalized Thickness Contours of the Pittsburgh Coal Bed in Pennsylvania, West Virginia, and Maryland
Compilation by Susan Tewalt,
Leslie Ruppert, Linda Bragg, Richard Carlton, David Brezinski, and Rachel Wallack;
Digital Compilation by Susan Tewalt, Leslie Ruppert, Rachel Wallack, and Eric
Weiss
U.S. Geological Survey Open-File Report 97-748
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Created by the EERT WWW Staff.
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