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56 HVL 305
FORTEY, Richard A.
A revision of Ordovician series and stages from the historical type area / R.A.Fortey et al. -- Cambridge : Cambridge University Press, 199-. -- S.15-30, : obr. -- In: Geological Magazine, 1995, vol.132, no.1.. -- bibl.
Ordovician - chronostratigraphy - England - Wales - Correlation Chart of the British Ordovician System
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57794
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