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*KEIKO KITAMURA
Forestry and Forest Products Research Institute
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TETSUYA MATSUI
Forestry and Forest Products Research Institute
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MAKOTO KOBAYASHI
Echigo-Matsunoyama Museum of Natural Science
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HITOSHI SAITOU
Kuromatsunai Beech Tree Museum
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KANJI NAMIKAWA
Hokkaido University of Education
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Yoshiaki Tsuda
Uppsala University