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2
Fossil collecting in Pennsylvania /
by Hoskins, Donald M.
Published 1983
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3
Upper Cambrian fossils from Bucks County, Pennsylvania.
by Howell, Benjamin F. 1890-1976.
Published 1957
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4
The Pennsylvanian Mill Creek limestone in Pennsylvania.
by Chow, Minchen Ming, 1920-
Published 1951
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5
Lower Pennsylvanian ammonoids from the Bloyd formation of Arkansas and Oklahoma /
by McCaleb, James A.
Published 1968
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