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United Nations Environment Programme ,  [Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20] ,  Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20

United Nations Environment Programme ,  Intergovernmental Oceanographic Commission ,  International Atomic Energy Agency ,  [Guidelines for Determining inputs of Inorganic Contaminants into Estuaries: Reference Methods for Marine Pollution Studies No. 41] ,  Guidelines for Determining inputs of Inorganic Contaminants into Estuaries: Reference Methods for Marine Pollution Studies No. 41