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*Satoru Suzuki
Cold region environment conservation group, Hokkaido research center, Forestry and forest products research institute
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Katsumi Yamanoi
Cold region environment conservation group, Hokkaido research center, Forestry and forest products research institute
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Kenzo Kitamura
Cold region environment conservation group, Hokkaido research center, Forestry and forest products research institute
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Yuichiro Nakai
Cold region environment conservation group, Hokkaido research center, Forestry and forest products research institute