1. U.S. Environmental Protection Agency.National Air Pollutant Emission Trends, 1900-1995;Office of Air Quality Planning and Standards: Research Triangle Park, NC, October 1996; EPA-454/R-96-007.
2. Hidy, G.M.Atmospheric Sulfur and Nitrogen Oxides;Academic Press: New York, 1994.
3. National Research Council.Acid Deposition: Atmospheric Processes in Eastern North America. A Review of Current Scientific Understanding;National Academy Press: New York, 1983.
4. National Acid Precipitation Assessment Program.National Acid Precipitation Assessment Program: 1990 Integrated Assessment Report;Washington, DC, 1990.
5. Clean Air Act. Public Law 101-549, 1990.