Jacques Verniers (1999)
Calibration of Chitinozoa versus graptolite biozonation in the Wenlock of Builth Wells district (Wales,U.K.),compared with other areas in Avalonia and Baltica
Bollettino della Societa Paleontologica Italiana, vol. 38 (2-3) p. 359-380.
18586, 132, Lg, CALBRAB, SIL, STRATBIO
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