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1Subjects: “...Geology, Stratigraphic Permian....”
Government Document Book -
2by Bowsher, Arthur Leroy, 1917-Subjects: “...Geology, Stratigraphic Paleozoic....”
Published 1957
Government Document Book -
3Subjects: “...Geology, Stratigraphic Permian. http://id.loc.gov/authorities/subjects/sh85054107...”
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