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砂川 一郎, 高橋 泰, 木村 郁子, 寒河江 登志朗. "鶴天、草食性動物の歯で作られた緒締め(一般講演15,一般講演論文要旨,平成13年度宝石学会(日本)特別講演及び一般講演論文要旨)." Journal of The Gemmological Society of Japan 23.1-4 (2002) 96