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AuthorInstitute of Water Management of the Ministry of Environmental Protection and Water Management of the German Democratic Republic (2)United Nations Environment Programme (2)Subject
ECOSYSTEMS (2)
EGYPT (2)
POLAND (2)
SURFACE WATERS (2)
AQUATIC ECOLOGY (1)CHEMICALS (1)DRAINAGE (1)ECONOMIC DEVELOPMENT (1)FERTILIZER USE (1)FISH (1)... View MoreDate Issued1976 (2)Has File(s)
true (2)