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Nikolaisen, Frank. The middle Ordovician of the Oslo Region, Norway: 32. Trilobites of the family Remopleurididae. Frank Nikolaisen. 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. 108 s. : .Vol. 62, Number 4
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