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You searched for: Creator Personal Names Clendening, John A. (John Albert), 1932- Remove constraint Creator Personal Names: Clendening, John A. (John Albert), 1932- All Subjects Geology, Stratigraphic--Pennsylvania. Remove constraint All Subjects: Geology, Stratigraphic--Pennsylvania. Subject Topical Plant spores, Fossil. Remove constraint Subject Topical: Plant spores, Fossil.

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