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system of classification
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classification system of soil erosion
土壤侵蚀分类系统
System of Rock Classification C.I.P.W.
克伊皮华岩石分类法
(Cros. iddings,Pirsson, Washington)
System of Rock Classification C.I.P.W.
C.I.P.W. 〔四氏〕岩石分类法
(Cros. iddings,Pirsson, Washington)
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