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Itoigawa, J. (1958). Molluscan fossils from the Niitsu, Higashiyama and Takezawa oil-fields, Niigata Prefecture, Japan. Memoirs of the College of Science, University of Kyoto, ser. B. 24: 249-263, 2 pls.
Itoigawa, J. (1958). Molluscan fossils from the Niitsu, Higashiyama and Takezawa oil-fields, Niigata Prefecture, Japan. Memoirs of the College of Science, University of Kyoto, ser. B. 24: 249-263, 2 pls.