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Yochelson E.L. (1960). Permian Gastropoda of the southwestern United States. 3. Bellerophontacea and Patellacea. Bulletin of the American Museum of Natural History. 119(4): 205-294.
Yochelson E.L. (1960). Permian Gastropoda of the southwestern United States. 3. Bellerophontacea and Patellacea. Bulletin of the American Museum of Natural History. 119(4): 205-294.
