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United Nations Environment Programme ,  [The Environmental Impacts of Production and Use of Energy Part I: Fossil Fuels] ,  The Environmental Impacts of Production and Use of Energy Part I: Fossil Fuels

United Nations Environment Programme ,  World Health Organization ,  [Oxides of Nitrogen - Environmental Health Criteria 4] ,  Oxides of Nitrogen - Environmental Health Criteria 4

United Nations Environment Programme ,  International Institute for Tropical Agriculture ,  [Nitrogen Cycling in West African Ecosystems: Proceedings of a Workshop Arranged by the SCOPE/UNEP International Nitrogen Unit in Collaboration with MAB (Unesco) and IITA] ,  Nitrogen Cycling in West African Ecosystems: Proceedings of a Workshop Arranged by the SCOPE/UNEP International Nitrogen Unit in Collaboration with MAB (Unesco) and IITA