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United Nations Environment Programme ,  [Needs and Specifications for a Biodiversity Information Network : Proceedings of an International Workshop] ,  Needs and Specifications for a Biodiversity Information Network : Proceedings of an International Workshop

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