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Russell, L.S. (1926). Mollusca of the Paskapoo Formation in Alberta. Transactions of the Royal Society of Canada, third series. Section IV - Geological Sciences. 20: 207-220.
Russell, L.S. (1926). Mollusca of the Paskapoo Formation in Alberta. Transactions of the Royal Society of Canada, third series. Section IV - Geological Sciences. 20: 207-220.
