Pilsbry, H. A. (1916). Notes on the anatomy of Oreohelix, with a catalogue of the species. Proceedings of the Academy of Natural Sciences of Philadelphia. 68(3): 340-359, plates 19-22.
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Pilsbry, H. A.
1916
Notes on the anatomy of <i>Oreohelix</i>, with a catalogue of the species.
Proceedings of the Academy of Natural Sciences of Philadelphia