Pierce, H.G.; Constenius, K.N. (2001). Late Eocene-Oligocene nonmarine mollusks of the northern Kishenehn Basin, Montana and British Columbia. Annals of Carnegie Museum. 70(1): 1-112.
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Pierce, H.G.; Constenius, K.N.
2001
Late Eocene-Oligocene nonmarine mollusks of the northern Kishenehn Basin, Montana and British Columbia