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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 ,  [Committee of International Development Institutions on the Environment (CIDIE): Workshop on Environmental and Natural Resource Accounting: Summary Record - Environmental Economics Series Paper No.3] ,  Committee of International Development Institutions on the Environment (CIDIE): Workshop on Environmental and Natural Resource Accounting: Summary Record - Environmental Economics Series Paper No.3