1
Author: Fleeger, Gary M.
Published 2004
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Electronic

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2
Author: Sisler, James D. 1894-
Published 1933
Record Source: Published Materials
“...Geological Survey of Pennsylvania....”
Book

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3
Published 1999
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Book

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4
Author: Dodge, Clifford H.
Published 2005
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Electronic

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5
Author: Shaulis, James R.
Published 2007
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Electronic

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8
Author: Becher, Albert E.
Published 1991
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Book

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9
Published 1883
Record Source: Published Materials
“...Geological Survey of Pennsylvania....”
Internet Archive, State Library of Pennsylvania
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10
Author: Davis, Drew K.
Published 1989
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Book

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11
Author: Faill, Rodger T.
Published 2004
Record Source: Published Materials
“...Geological Survey of Pennsylvania...”
Electronic

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