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潮田 常三, 伊東 正夫, 森 信行, 荒川 勇次郎, 後藤 孝雄, 石躍 胤光. "桑園土性調査 (第III報) : 山形県下の桑園土壌に就て (其の2) 2 理化学的諸性質の検討." Japanese Journal of Soil Science and Plant Nutrition 23.2 (1953) 154