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Yokoyama M. (1926). Fossil shells from Sado. Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology. 1(8): 249–312, pls. 32–37.
Yokoyama M. (1926). Fossil shells from Sado. Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology. 1(8): 249–312, pls. 32–37.