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Nakano, M. (1957). On the occurrence of Psilotrigonia in the Cretaceous of the Kwanto Mountainous Land, Japan. Journal of Science of the Hiroshima University, Series C, Earth and Planetary Sciences. 2: 69-71.
Nakano, M. (1957). On the occurrence of Psilotrigonia in the Cretaceous of the Kwanto Mountainous Land, Japan. Journal of Science of the Hiroshima University, Series C, Earth and Planetary Sciences. 2: 69-71.
