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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 ,  Convention on the Conservation of Migratory Species of Wild Animals (CMS) ,  [Convention sur la conservation des espèces migratrices appartenant a la faune sauvage (CMS): Compte rendu de la quatrième session de la Conference des Parties, Convención sobre la conservación de las especies migratorias de animales silvestres (CMS): Actas de la cuarta reunion de la Conferencia de las Partes] ,  [Convention on the Conservation of Migratory Species of Wild Animals (CMS): Proceedings of the Fourth Meeting of the Conference of the Parties] ,  Convention on the Conservation of Migratory Species of Wild Animals (CMS): Proceedings of the Fourth Meeting of the Conference of the Parties