BOGDANOVA, T.N. & V.A. PROZOROVSKY (EDS.)
Substantiaition of the Barremian/Aptian Boundary. [Turkmenistan]
1999. reprint: Scripta geol. Spec. issue 3; pp. 45-81, 4 fig. 8 plts. with ammonites. Orig. reprint, with presentation by first author, very good.

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