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徐 胤洙, 久馬 一剛, 川口 桂三郎. "9-10 畑土壌評価法に関する研究 : 第三報 畑土壌の肥沃度(北海道畑土壌の例)(9 土壌生成・分類および調査)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 21.0 (1975) 106