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Hammann, Wolfgang. The Ordovician System in southwestern Europe (France, Spain, Portugal) : Correlation Chart and Explanatoty Text. by Hammann, W., Robardet, M. and Romano, M. In International Union of geological sciences, 1982, publ.no.11. Paris : IUGS Editorial Office, 1982, International Union of geological sciences, 1982, publ.no.11.S.1-47, : .
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