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Kobayashi, T. & Kaseno, Y. (1947). A new liassic species of Trigonia s. str. (i. e. Lyriodon) from the Kitakami mountains, Nippon. Japanese Journal of Geology and Geography. 20: 41-44.
Kobayashi, T. & Kaseno, Y. (1947). A new liassic species of Trigonia s. str. (i. e. Lyriodon) from the Kitakami mountains, Nippon. Japanese Journal of Geology and Geography. 20: 41-44.
