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Yokoyama, M. (1931). Neogene shells from Karafto and the Hokkaido. Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology. 3(4): 185-196.
Yokoyama, M. (1931). Neogene shells from Karafto and the Hokkaido. Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology. 3(4): 185-196.
