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Duff, K.L. (1978). Bivalvia from the English Lower Oxford Clay (Middle Jurassic). Monographs of the Palaeontographical Society, London. 132 (553): 1-137.
Duff, K.L. (1978). Bivalvia from the English Lower Oxford Clay (Middle Jurassic). Monographs of the Palaeontographical Society, London. 132 (553): 1-137.