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Thompson, F. G. & Brewer, G. P. (2000). Landsnails of the genus Humboldtiana from northern Mexico (Gastropoda, Pulmonata, Helicoidea, Humboldtianidae). Bulletin of the Florida Museum of Natural History. 43(2): 49-77.
Thompson, F. G. & Brewer, G. P. (2000). Landsnails of the genus Humboldtiana from northern Mexico (Gastropoda, Pulmonata, Helicoidea, Humboldtianidae). Bulletin of the Florida Museum of Natural History. 43(2): 49-77.