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Google圖書搜尋
Proceedings and papers of the second International congress of soil science, Leningrad-Moscow, USSR, July 20-31, 1930
出版
State publishing house of agricultural, cooperative and collective farm literature (Selkolkhozgis)
, 1932
URL
http://books.google.com.hk/books?id=DdW5laqnwDIC&hl=&source=gbs_api