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International Hydrological Decade, Co-ordinating Council, Seventh Session, Paris, 22-26 November 1971 : Final Report
Co-ordinating Council of the International Hydrological Decade. SessionUnesco
出版Unesco, 1972
URLhttp://books.google.com.hk/books?id=E8b_AstSuiUC&hl=&source=gbs_api