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1by Swanson, Roger Warren, 1914-Subjects: “...Geology, Stratigraphic Permian. http://id.loc.gov/authorities/subjects/sh85054107...”
Published 1956
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2by McKelvey, V. E. (Vincent Ellis), 1916-Subjects: “...Geology, Stratigraphic Permian. http://id.loc.gov/authorities/subjects/sh85054107...”
Published 1959
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Government Document eBook