Hatai, K. & T. Kotaka. (1970). A problematica from the Nishikurosawa Formation, Oga Peninsula, Akita Prefecture, northeast Honshu, Japan. Saito Ho-on Kai Museum Research Bulletin. 39: 1-5.
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Hatai, K. & T. Kotaka
1970
A problematica from the Nishikurosawa Formation, Oga Peninsula, Akita Prefecture, northeast Honshu, Japan