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An aminostratigraphy for the British Quaternary based on Bithynia opercula.
Penkman KE, Preece RC, Bridgland DR, Keen DH, Meijer T, Parfitt SA, White TS, Collins MJ. Penkman KE, et al. Among authors: bridgland dr. Quat Sci Rev. 2013 Feb 1;61(C):111-134. doi: 10.1016/j.quascirev.2012.10.046. Quat Sci Rev. 2013. PMID: 23396683 Free PMC article.