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Roth, B. (1991). A phylogenetic analysis and revised classification of the North American Haplotrematidae (Gastropoda: Pulmonata). American Malacological Bulletin. 8(2): 155-163.
Roth, B. (1991). A phylogenetic analysis and revised classification of the North American Haplotrematidae (Gastropoda: Pulmonata). American Malacological Bulletin. 8(2): 155-163.
