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Owen, Alan W. The Middle Ordovician of the Oslo Region, Norway: 31. The upper Caradoc trilobites and brachiopods from Vestbraten, Ringerike. Alan W. Owen, David A. T. Harper. In Norsk Geologisk Tidsskrift: A Norwegian journal of geology founded in 1905 and issued by Norsk Geologisk Forening , Norsk Geologisk Tidsskrift: A Norwegian journal of geology founded in 1905 and issued by Norsk Geologisk Forening. 26 s. : .Vol. 62, Number 4
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