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Hershler, R. (1994). A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae). Smithsonian Contributions to Zoology. 554: 1-115.
Hershler, R. (1994). A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae). Smithsonian Contributions to Zoology. 554: 1-115.