1. 1. World Meteorological Organization (WMO) (1995 ) Scientific assessment of ozone depletion: 1994. Global ozone research and monitoring project. Report 37. Geneva, Switzerland.
2. 2. UNEP, J. C. Leun, M. Tevini, and R. C. Worrest (1989 ) Environmental effects panel report (. United Nations Environmental Programme, Nairobi, Kenya.
3. 4. World Meteorological Organization (WMO) (1992 ) Scientific assessment of ozone depletion: 1991. Global ozone research and monitoring project. Report 25. Geneva, Switzerland.
4. The Nature and Sources of Haze in the Shenandoah Valley/Blue Ridge Mountains Area