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1by Roen, John B.Subjects: “...Geology Pennsylvania Washington County Maps....”
Published 1968
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2by Kent, Bion H. (Bion Huntley), 1925-Subjects: “...Geology Pennsylvania Greene County Maps....”
Published 1969
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3by Kent, Bion H. (Bion Huntley), 1925-Subjects: “...Geology Pennsylvania Greene County Maps....”
Published 1969
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4by Schweinfurth, Stanley P.Subjects: “...Geology Pennsylvania Fayette County Maps....”
Published 1967
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5by Berryhill, Henry L., Jr. (Henry Lee), 1921-2013Subjects: “...Geology Pennsylvania Washington County Maps....”
Published 1964
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6by Berryhill, Henry L., Jr. (Henry Lee), 1921-2013Subjects: “...Geology Pennsylvania Washington County Maps....”
Published 1964
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7by Roen, John B.Subjects: “...Geology Pennsylvania Greene County Maps....”
Published 1970
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8by Kent, Bion H. (Bion Huntley), 1925-Subjects: “...Geology Pennsylvania Greene County Maps....”
Published 1971
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9by Berryhill, Henry L., Jr. (Henry Lee), 1921-2013Subjects: “...Geology Pennsylvania Washington County Maps....”
Published 1964
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10by Swanson, Vernon Emanuel, 1922-Subjects: “...Geology Pennsylvania Washington County Maps....”
Published 1964
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11Subjects: “...Geology Pennsylvania. http://id.loc.gov/authorities/subjects/sh2008117946...”
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12by Meisler, HaroldSubjects: “...Geology Pennsylvania. http://id.loc.gov/authorities/subjects/sh2008117946...”
Published 1968
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