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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 ,  [Pulp and paper Industry and the Environment – Seminar Papers and Documents] ,  Pulp and paper Industry and the Environment – Seminar Papers and Documents

United Nations Environment Programme ,  [Proceedings of the International Symposium on Efficient Water Use in Urban Areas: Innovative Ways of Finding Water for Cities - IETC Report Series No. 9] ,  Proceedings of the International Symposium on Efficient Water Use in Urban Areas: Innovative Ways of Finding Water for Cities - IETC Report Series No. 9

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