1. CHEMICAL & ENGINEERING NEWS 68: 4 (1990).
2. Global Ozone Research and Monitoring Project, No. 16, VI 1: 78 (1985).
3. Code of Federal Regulations 40: 265 (1989).
4. Toxic Release Inventory CD-ROM 1989
5. Beard, R. R., Patty's Industrial Hygiene and Toxicology: 4096 (1982).