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Soot-Ryen, H.; Soot-Ryen, T. (1960). The Middle Ordovician of the Oslo Region, Norway. 11. Pelecypoda. Norsk Geologisk Tidsskrift. 40: 81-122.
Soot-Ryen, H.; Soot-Ryen, T. (1960). The Middle Ordovician of the Oslo Region, Norway. 11. Pelecypoda. Norsk Geologisk Tidsskrift. 40: 81-122.