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Takeo TAKANO
the History of Joetsu-Shi
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Tuyoshi FUZITA
Research Institute of Joetsu Quaternary Geology
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Tadashi HASEGASWA
Niigata Prefectural Takada-Minamishiro Senior High School
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Cunrong GAO
China Institute for Geo-Encvironmental Monitoring
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Hisao TANAKA
Correspondence System Course of Niigata Prefectural Niigata Senior High School
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Takahisa YOSHIMURA
Niigata University