Pilsbry, H. A. & Ferriss, J. H. (1906). Mollusca of the Ozarkian Fauna. Proceedings of the Academy of Natural Sciences of Philadelphia. 58 (3): 529-567, plates 20-22.
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Pilsbry, H. A. & Ferriss, J. H.
1906
Mollusca of the Ozarkian Fauna.
Proceedings of the Academy of Natural Sciences of Philadelphia