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6
Author: Faill, Rodger T.
Published 2004
Record Source: Published Materials
Electronic

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8
Author: Sisler, James D. 1894-
Published 1933
Record Source: Published Materials
Book

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10
Published 1999
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Book

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11
Author: Davis, Drew K.
Published 1989
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Book

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Clear Filter Record Source: Published Materials Clear Filter Author: Geological Survey of Pennsylvania Clear Filter Collection: Catalog