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Yokoyama, M. (1925). Molluscan remains from the middle part of the Jô-ban coal-field. Journal of the College of Science, Imperial University of Tokyo, 45(7): 1-23.
Yokoyama, M. (1925). Molluscan remains from the middle part of the Jô-ban coal-field. Journal of the College of Science, Imperial University of Tokyo, 45(7): 1-23.
