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Richards, H. G. (1948). Fossil Mollusks from the Triassic of Pennsylvania. Notulae Naturae of The Academy of Natural Sciences of Philadelphia. 206: 1-4.
Richards, H. G. (1948). Fossil Mollusks from the Triassic of Pennsylvania. Notulae Naturae of The Academy of Natural Sciences of Philadelphia. 206: 1-4.
