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United Nations Environment Programme ,  [Rainwater Utilization for the World's People - Proceedings Volume 2] ,  Rainwater Utilization for the World's People - Proceedings Volume 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. IV] ,  Eutrosym ‘76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water – Vol. IV

World Health Organization ,  Food and Agriculture Organization of the United Nations ,  United Nations Environment Programme ,  [Proceedings of the Workshop on Irrigation and Vector-Borne Disease Transmission] ,  Proceedings of the Workshop on Irrigation and Vector-Borne Disease Transmission

United Nations Environment Programme ,  International Lake Environment Committee Foundation (ILEC) ,  [International Shiga Forum on Technology for Water Management in the 21st Century - Proceedings] ,  International Shiga Forum on Technology for Water Management in the 21st Century - Proceedings