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Yokoyama M. (1932). Tertiary Mollusca from the Coalfield of Uryu, Ishikari. Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology. 3(6): 221-247.
Yokoyama M. (1932). Tertiary Mollusca from the Coalfield of Uryu, Ishikari. Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology. 3(6): 221-247.
