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Davies, J. H.; Trueman, A. E. (1927). A Revision of the Non-Marine Lamellibranchs of the Coal Measures, and a Discussion of their Zonal Sequence. Quarterly Journal of the Geological Society. 83(1-5): 210-259.
Davies, J. H.; Trueman, A. E. (1927). A Revision of the Non-Marine Lamellibranchs of the Coal Measures, and a Discussion of their Zonal Sequence. Quarterly Journal of the Geological Society. 83(1-5): 210-259.