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Saul, L. R.; Squires, R. L. (2008). Cretaceous trichotropid gastropods from the Pacific slope of North America: Possible pathways to calyptraeid morphology. The Nautilus. 122(3): 115-142.
Saul, L. R.; Squires, R. L. (2008). Cretaceous trichotropid gastropods from the Pacific slope of North America: Possible pathways to calyptraeid morphology. The Nautilus. 122(3): 115-142.