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Russell, L.S. (1929). Upper Cretaceous and lower Tertiary Gastropoda from Alberta. Transactions of the Royal Society of Canada, third series. Section IV - Geological Sciences. 23: 81-90.
Russell, L.S. (1929). Upper Cretaceous and lower Tertiary Gastropoda from Alberta. Transactions of the Royal Society of Canada, third series. Section IV - Geological Sciences. 23: 81-90.
