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Paul, C.R.C. (1991). The morphology, palaeoecology, and taxonomic affinities of three British Tertiary species of "Planorbis" (Mollusca; Gastropoda). Tertiary Research. 13(1): 37-46.
Paul, C.R.C. (1991). The morphology, palaeoecology, and taxonomic affinities of three British Tertiary species of "Planorbis" (Mollusca; Gastropoda). Tertiary Research. 13(1): 37-46.