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Clark, B. L. (1932). Fauna of the Poul and Yakataga formations (Upper Oligocene) of southern Alaska. Geological Society of America Bulletin. 43: 797-846.
Clark, B. L. (1932). Fauna of the Poul and Yakataga formations (Upper Oligocene) of southern Alaska. Geological Society of America Bulletin. 43: 797-846.