http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
results of the 1995 survey : 1996 executive report
Convention on Long-Range Transboundary Air Pollution
International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests
United Nations Economic Commission for Europe
Convention on Long-Range Transboundary Air Pollution ; International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests