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United Nations Environment Programme ,  [Eutrosym '76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water - Vol. I, Part 1] ,  Eutrosym '76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water - Vol. I, Part 1

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

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

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