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Kobayashi, T.; Nakano, M. (1958). The Lower and Middle Cretaceous trigonians in Wakayama, Oita and Kumamoto Prefectures, West Japan. Japanese Journal of Geology and Geography. 29, 139-152.
433885
Kobayashi, T.; Nakano, M.
1958
The Lower and Middle Cretaceous trigonians in Wakayama, Oita and Kumamoto Prefectures, West Japan
Japanese Journal of Geology and Geography
29, 139-152
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Nipponitrigonia kikuchiana var. plicata T. Kobayashi & M. Nakano, 1958 † (original description)
Nipponitrigonia quadrata T. Kobayashi & M. Nakano, 1958 † (original description)
Nipponitrigonia quadrata T. Kobayashi & M. Nakano, 1958 † (original description)