United Nations Environment Programme
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Institute of Water Management of the Ministry of Environmental Protection and Water Management of the German Democratic Republic
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[Eutrosym '76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water Vol. I, Part 2]
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Eutrosym '76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water Vol. I, Part 2
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