Pierce, H.G. (1993). The nonmarine mollusks of the Late Oligocene-Early Miocene Cabbage Patch fauna of western Montana III. Aquatic mollusks and conclusions. Journal of Paleontology. 67(6): 980-993.
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Pierce, H.G.
1993
The nonmarine mollusks of the Late Oligocene-Early Miocene Cabbage Patch fauna of western Montana III. Aquatic mollusks and conclusions