1. A global geochemical database for environmental and resource management: recommendations for international geochemical mapping;Darnley,1995
2. Global terrestrial grid: 160 × 160 km cells. Files, prefixed gtn, in dBase, Access, Lotus and ASCII comma delimited formats available from Geological Survey of Canada at: NRCan.gc.ca anonymous FTP site in directory/gsc/igcp360;Gustavsson,1996
3. An Agenda of Science for Environment and Development into the 21st Century (AGENDA 21);Norse,1992
4. Metals in the Global Environment: Facts and Misconceptions;Thornton,1995