Johansen, M. B.; Surlyk, F. (1990). Brachiopods and the stratigraphy of the Upper Campanian and Lower Maastrichtian Chalk of Norfolk, England. Palaeontology. 33(4): 823-872.
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Johansen, M. B.; Surlyk, F.
1990
Brachiopods and the stratigraphy of the Upper Campanian and Lower Maastrichtian Chalk of Norfolk, England