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Hershler, R.; Gustafson, D. L. (2001). First record for springsnails (Mollusca: Hydrobiidae: Pyrgulopsis) from the northern Rocky Mountains. Proceedings of the Biological Society of Washington. 114: 297-308.
Hershler, R.; Gustafson, D. L. (2001). First record for springsnails (Mollusca: Hydrobiidae: Pyrgulopsis) from the northern Rocky Mountains. Proceedings of the Biological Society of Washington. 114: 297-308.
