Yokoyama M. (1924). Molluscan remains from the lowest part of the Jo-ban coal-field. Journal of the College of Science, Imperial University of Tokyo. 45(3): 1–22, pls 1–5.
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Yokoyama M.
1924
Molluscan remains from the lowest part of the Jo-ban coal-field.
Journal of the College of Science, Imperial University of Tokyo.