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Hamar, György. The middle Ordovician of the Oslo region, Norway: 22. Preliminary report on conodonts from the Oslo-Asker and Ringerike districts. György Hamar. In Norsk Geologisk Tidsskrift , Norsk Geologisk Tidsskrift. The middle Ordovician of the Oslo region, Norway 22. 74 s. : .Vol. 46, part 1
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