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Tazawa, Jun-ichi. A new species of Richthofenia (Brachiopoda) from the Permian of northeast Japan. Jun-ichi Tazawa and Hideo Araki. In Saito Ho-on Kai Museum Natural History Research Bulletin, 1984, no.52. Saito Ho-on Kai Museum, 1984, Saito Ho-on Kai Museum Natural History Research Bulletin, 1984, no.52.S.1-7, : .
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