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Yuichi YAMAURA
Graduate School of Agriculture, Hokkaido Univ.
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Hiroyasu OKA
Department of Forest Policy and Economics, Forestry and Forest Products Research Institute
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Noritaka KUTSUKAKE
Agriculture-and-Forestry Commerce-and-Industry Division, Assabu Town Office
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Toru OKAMOTO
Department of Forest Site Environment, Forestry and Forest Products Research Institute