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3. Effect of anomalous temperature on the chemical composition of thermal water, Gora hot springs, Hakone volcano (in Jap);Hirano;Bull. Hot Spring. Res. Inst., Kanagawa Pref.,1968
4. Geology of Hakone volcano and adjacent areas, part 1;Kuno;J. Fac. Sci., Univ. Tokyo, sec. 2,1950
5. Catalogue of the active volcanoes and solfatara fields of Japan, Taiwan and Marianas;Kuno,1962