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Tsumoru Sagayama
Dept. Marine Geoscience, Geological Survey of Hokkaido
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Yaeko Igarashi
Institute for Paleoenvironment of Northern Regions
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Tsutomu Kondo
Hokkaido Gijutsu Consultant Co. Ltd.
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Kotaro Kamada
Dept. Education, Hirosaki University
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Mitsuo Yoshida
Japan International Cooperation Agency
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Tsutomu Chitoku
Hokumoncho 17-2155, Asahikawa 070-0825, Japan
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Tokuji Tonosaki
VOLO Co. Ltd.
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Chiharu Kudo
Shinkotoni Junior High School
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Satoshi Okamura
Sapporo Campus, Hokkaido University of Education
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Makoto Kato
Miyanomori 1-18, Sapporo 064-0951, Japan.