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Pilsbry, H. A. (1927). Expedition to Guadalupe Island, Mexico in 1922. Land and freshwater mollusks. Proceedings of the California Academy of Sciences. (4) 16(7): 159-203, plates 6-12.
Pilsbry, H. A. (1927). Expedition to Guadalupe Island, Mexico in 1922. Land and freshwater mollusks. Proceedings of the California Academy of Sciences. (4) 16(7): 159-203, plates 6-12.
