Pierce, H.G. (1992). The nonmarine mollusks of the Late Oligocene-Early Miocene Cabbage Patch fauna of western Montana. II. Terrestrial gastropod families other than Pupillidae (Pulmonata: Stylommatophora). Journal of Paleontology. 66(4): 610-620.
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Pierce, H.G.
1992
The nonmarine mollusks of the Late Oligocene-Early Miocene Cabbage Patch fauna of western Montana. II. Terrestrial gastropod families other than Pupillidae (Pulmonata: Stylommatophora)