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Nagao, T. (1930). On some Cretaceous fossils from the Islands of Amakusa, Kyûshû, Japan. Journal of the Faculty of Science, Hokkaido Imperial University, Series IV, Geology and Mineralogy. 1: 1-26.
Nagao, T. (1930). On some Cretaceous fossils from the Islands of Amakusa, Kyûshû, Japan. Journal of the Faculty of Science, Hokkaido Imperial University, Series IV, Geology and Mineralogy. 1: 1-26.