Binney, W.G. 1861. Catalogue of land and freshwater univalve mollusks collected in British America by Messrs. Ross, Kennicott, and Drexler, and deposited in the Smithsonian Collection. Proceedings of the Academy of Natural Sciences of Philadelphia 1861: 330.
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Binney, W.G. 1885. A manual of American land shells. United States National Museum, Bulletin 28: 528 p.
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Binney, W.G., Bland, T. 1869. Land and freshwater shells of North America. Part I. Pulmonata Geophila. Smithsonian Miscellaneous Collections 194: xii + 316 p.
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Dall, W.H. 1905. Land and fresh water mollusks. Harriman Alaska Expedition 13: New York: Doubleday, Page and Co. 171 p. + 2 pl.
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Gould, A.A. 1870. Report on the Invertebrata of Massachusetts, published agreeably to an order of the Legislature. Second edition, comprising the Mollusca. Boston: Wright & Potter. v + [3] + 524 p., pl. 16-27.
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Gratacap, L.P. 1901. Catalogue of the Binney and Bland Collection of the terrestrial air-breathing mollusks of the United States and Territories, in the American Museum of Natural History, with enumeration of the types and figured specimens, and supplementary notes. Bulletin of the American Museum of Natural History 14(23): 335-403.
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Kalas, L. 1978. Freshwater and some terrestrial Mollusca from the Yukon and Northwest Territories. Project FW-67-6, Autoecology of shelled invertebrates. Burlington, Ont.: National Water Research Institute, Canada Centre for inland Waters; unpublished report. Unpaginated.
La Rocque, A. 1953. Catalogue of the Recent Mollusca of Canada. National Museum of Canada, Bulletin 129: x + 406 p.
Oughton, J. 1945. Great Slave Lake. The Nautilus 58(3): 73-79.
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Pilsbry, H.A. 1919. [Pupillidae; Subfamily Gastrocoptinae (continued), Subfamily Vertigininae]. Manual of Conchology, Structural and Systematic, with Illustrations of the Species. Second Series: Pulmonata 25(98): 65-144, pl. 6-10.
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Pilsbry, H.A. 1946. Land Mollusca of North America (north of Mexico), 2 (1). The Academy of Natural Sciences of Philadelphia, Monographs 3: frontispiece, i-vi + 1-520.
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Pilsbry, H.A. 1948. Land Mollusca of North America (north of Mexico), 2 (2). The Academy of Natural Sciences of Philadelphia, Monographs 3: i-xlvii + 521-1113.
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