1. National Council for Air and Stream Improvement, Inc.; P.O. Box 13318 Research Triangle Park NC 27709
2. Dep. of Forest Resources and Environmental Conservation; Virginia Tech; 228 Cheatham Hall (0234) Blacksburg VA 24061
3. School of Forest Resources and Environmental Science Michigan Technological Univ.; 1400 Townsend Dr. Houghton MI 49931
4. School of Environmental and Forest Sciences University of Washington; Box 352100 Seattle WA 98195
5. Warnell School of Forestry and Natural Resources Univ. of Georgia; 180 E. Green Street Athens GA 30602