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Peel, J. S. (1972). Observations on some Lower Palaeozoic tremanotiform Bellerophontacea (Gastropoda) from North America. Palaeontology. 15(3): 412-422.
Peel, J. S. (1972). Observations on some Lower Palaeozoic tremanotiform Bellerophontacea (Gastropoda) from North America. Palaeontology. 15(3): 412-422.