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Nakano, M. & Numano, K. (1961). On some Gyliakian Pterotrigoniae from Kyushu and Hokkaido. Transactions and Proceedings of the Palaeontological Society of Japan, new series. 43: 89-98.
Nakano, M. & Numano, K. (1961). On some Gyliakian Pterotrigoniae from Kyushu and Hokkaido. Transactions and Proceedings of the Palaeontological Society of Japan, new series. 43: 89-98.
