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Cope, J. C. W. (1999). Middle Ordovician bivalves from Mid-Wales and the Welsh Borderland. Palaeontology. 42(3): 467-499.
Cope, J. C. W. (1999). Middle Ordovician bivalves from Mid-Wales and the Welsh Borderland. Palaeontology. 42(3): 467-499.
