Gould, A.A. (1846). Descriptions of the species Helix, from the Shells of the United States Exploring Expedition. Proceedings of the Boston Society of Natural History, 2: 175–179. Boston.
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Gould, A.A.
1846
Descriptions of the species Helix, from the Shells of the United States Exploring Expedition
Proceedings of the Boston Society of Natural History