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Roth, B. (2000). Upper Cretaceous (Campanian) land snails (Gastropoda: Stylommatophora) from Washington and California. Journal Molluscan Studies. 66(3): 373-381.
Roth, B. (2000). Upper Cretaceous (Campanian) land snails (Gastropoda: Stylommatophora) from Washington and California. Journal Molluscan Studies. 66(3): 373-381.