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1
Revised lithostratigraphic nomenclature of the Pottsville and Allegheny groups (Pennsylvanian), Clearfield County, Pennsylvania /
by Edmunds, William E.
Harrisburg, Pa. : Bureau of Topographic and Geologic Survey, 1969

Book
2
Revised lithostratigraphic nomenclature of the Pottsville and Allegheny groups (Pennsylvanian) : Clearfield County, Pennsylvania /
by Edmunds, William E.
Harrisburg [Pa.] : Pennsylvania. Bureau of Topographic and Geologic Survey, 1969

Government Document Book
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