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Clift, S. G.; Trueman, A. E. (1929). The Sequence of Non-Marine Lamellibranchs in the Coal Measures of Nottinghamshire and Derbyshire. Quarterly Journal of the Geological Society. 85(1): 77-108.
Clift, S. G.; Trueman, A. E. (1929). The Sequence of Non-Marine Lamellibranchs in the Coal Measures of Nottinghamshire and Derbyshire. Quarterly Journal of the Geological Society. 85(1): 77-108.