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Fortey, Richard A. International correlation of the base of the Llanvirn Series Ordovician System. by Richard A.Fortey, Andrew J.Beckly and Adrian W.A.Rushton. In Newsletter on Stratigraphy, Berlin-Stuttgart, 1990, 22, 2/3. Berlin - Stutggart, 199-, Newsletter on Stratigraphy, Berlin-Stuttgart, 1990, 22, 2/3.S.119-142, : .
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