Não informado. (1921). Contribution from the Institute of Geology and Paleontology. Tohoku University.
Citace podle Chicago (17th ed.)Não informado. Contribution from the Institute of Geology and Paleontology. Sendai, Japão: Tohoku University, 1921.
Citace podle MLA (8th ed.)Não informado. Contribution from the Institute of Geology and Paleontology. Tohoku University, 1921.
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