Hanzawa, S. and Urata, H. (1964): Supplementary note to the nummulitic rocks of Amakusa, Kyushu, Japan. Reports on Earth Science, Department of General Education, Kyushu University, vol. 11, p. 1-12, pls. 1-6.
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Hanzawa, S. and Urata, H. (1964): Supplementary note to the nummulitic rocks of Amakusa, Kyushu, Japan. Reports on Earth Science, Department of General Education, Kyushu University, vol. 11, p. 1-12, pls. 1-6