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About HAI D N
About Ha Noi Agricultural Univ., Ha Noi, VNM
About HUY T Q
About Ha Noi Agricultural Univ., Ha Noi, VNM
About EGASHIRA K
About Kyushu Univ., Fukuoka, JPN
About Clay Science
About sierozem
About Vietnam
About Soil formation(=soil genesis,pedogenesis)and classification
About ベトナム
About 灰色
About 退化
About 土壌
About 鉱物
About 粘土