Systematics, Biostratigraphy and Biogeography of Latest Cretaceous and Early Tertiary Viviparidae (mollusca, Gastropoda) of Southern Saskatchewan, Western North Dakota, Eastern Montana, and Northern WyomingJoseph Herbert Hartman
Systematics, Biostratigraphy and Biogeography of Latest Cretaceous and Early Tertiary Viviparidae (mollusca, Gastropoda) of Southern Saskatchewan, Western North Dakota, Eastern Montana, and Northern Wyoming