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1by Trexler, J. Peter, 1926-Subjects: “...Geology Pennsylvania Northumberland County Maps....”
Published 1968
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2by Trexler, J. Peter, 1926-Subjects: “...Geology Pennsylvania Dauphin County Maps....”
Published 1968
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3Published 1968Subjects: “...Geology Pennsylvania Northumberland County Maps....”
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4by Trexler, J. Peter, 1926-Subjects: “...Geology Pennsylvania Schuylkill County Maps....”
Published 1968
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5by Wood, Gordon H. (Gordon Harry), 1919-Subjects: “...Geology Pennsylvania Schuylkill County Maps....”
Published 1968
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6Subjects: “...Geology Pennsylvania....”
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7by Wood, Gordon H. (Gordon Harry), 1919-Subjects: “...Coal Geology Pennsylvania Dauphin County Maps....”
Published 1968
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8Subjects: “...Geology Pennsylvania. http://id.loc.gov/authorities/subjects/sh2008117946...”
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9by Wood, Gordon H. (Gordon Harry), 1919-Subjects: “...Coal Geology Pennsylvania Schuylkill County Maps....”
Published 1968
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