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1
Pennsylvanian geology of a part of the southern Appalachian coal field,
by Wanless, Harold R. (Harold Rollin), 1899-1970
[New York] Geological Society of America, 1946

Book
2
Elements of Pennsylvanian stratigraphy, central Appalachian Basin /
Boulder, Colo. : Geological Society of America, 1994

Book
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