Pilsbry, H. A. (1905). Mollusca of the southwestern United States, I: Urocoptidae; Helicidae of Arizona and New Mexico. Proceedings of the Academy of Natural Sciences of Philadelphia. 57: 211-290, plates 11-27.
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Pilsbry, H. A.
1905
Mollusca of the southwestern United States, I: Urocoptidae; Helicidae of Arizona and New Mexico.
Proceedings of the Academy of Natural Sciences of Philadelphia