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Tsutomu Konndo
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Yaeko Igarashi
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Mituo Yoshida
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Toshikazu Inoue
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Nobuyuki Taira
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Masamichi Yamazaki
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Satoshi Okamura
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Toshitsugu Maeda
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Tsumoru Sagayama
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Makoto Sugawara
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Kimitaka Kokubu
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Satoshi Yasui
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Author's Organization:Hokkaido Soil Research Co-operation Earth Science Co.,Ltd., Geoscinence Co.,Ltd., Yonezawachuou Senior hige school of Shiinogakuen Niigata Branch of Meiji Consultant Co.,Ltd., Niigata Branch of Meiji Consultant Co.,Ltd., Sapporo Campus,Hokkaido Education University Kouryou Junior high school of Sapporo City Dept.,Marine Geoscience,Geological Survey of Hokkaido / Utoro Junior high school of Shari Town Sapporo Branch of OYO Corporation [in Japanese]