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†Frognaspis Nikolaisen 1965
urn:lsid:organismnames.com:name:2548246
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†Frognaspis Nikolaisen 1965
Nikolaisen 1965. The Middle Ordovician of the Oslo region, Norway. 18. Rare trilobites of the families Olenidae, Harpidae, Ityophoridae and Cheiruridae. Norsk Geologisk Tidsskrift, 45(2) 1965: 231-248