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Evans, D. H. (2005). The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monographs of the Palaeontographical Society. 158(623): 1-77.
Evans, D. H. (2005). The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monographs of the Palaeontographical Society. 158(623): 1-77.
