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*Makoto Kobayashi
Graduate School of Agriculture, Hokkaido Univ.
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Y. P. Nemilostiv
Graduate School of Agriculture, Far Eastern State Agricultural Univ.
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Toshikazu Takanishi
Hokkaido Univ. Forest
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Chikara Kotsuka
Hokkaido Univ. Forest
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Tatsuya Kamiura
Hokkaido Univ. Forest
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Keiji Komiya
Hokkaido Univ. Forest
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Takuya Kajimoto
Forestry and Forest Product Institute
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Youjiro Matsuura
Forestry and Forest Product Institute
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Toshiya Yoshida
Hokkaido Univ. Forest
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Fuyuki Satoh
Hokkaido Univ. Forest
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Kaichiro Sasa
Hokkaido Univ. Forest
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Takayoshi Koike
Graduate School of Agriculture, Hokkaido Univ.