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Chronic, H. (1952). Molluscan fauna from the Permian Kaibab Formation, Walnut Canyon, Arizona. Bulletin of the Geological Society of America. 63(2): 95-165.
Chronic, H. (1952). Molluscan fauna from the Permian Kaibab Formation, Walnut Canyon, Arizona. Bulletin of the Geological Society of America. 63(2): 95-165.
