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2by Sohn, I. G. (Israel Gregory), 1911-2000Subjects: “...Paleontology Permian....”
Published 1954
Government Document Book -
3by Yang, Zhendong, 1945-Subjects: “...Paleontology Permian....”
Published 1993
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Thesis Book -
4by Sohn, I. G. (Israel Gregory), 1911-2000Subjects: “...Paleontology Permian. http://id.loc.gov/authorities/subjects/sh85097140...”
Published 1954
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Government Document eBook