1. Condensing Heat Exchanger Corp. (CHX), Warnerville, NY
2. Tri-Mer Corporation, Owosso, MI, 48867
3. http://www.tri-mer.com/whatsnew.html
4. Marrack, D. Particulate Pollution—A Biological Dilemma. Presented at A&WMA Annual Conference, San Diego, CA, June 1998; Paper 98-MA 1202.