1. 1. Reducing Risk , Setting Priorities and Strategies for Environmental Protection, Environmental Protection Agency, SAB-EC-90-021, Washington, D.C. (1990 ).
2. 3. EPA , National Emission Standards for Hazardous Air Pollutants for Source Categories: Perchloroethylene Dry Cleaning Facilities, Final Rule, Federal Register 58:49354, Environmental Protection Agency, Washington, D.C., September 22 (1993 ).
3. 4. Memorandum and Attachments Regarding Request for Comments on Recommended List of "Key" NHEXAS Pollutants from Elizabeth Bryan to NHEXAS Workshop Participants , (1992 ).
4. 5. Toxicological Profile for Tetrachloroethylene , Department of Health and Human Services, Agency for Toxic Substances and Disease Registry, ATSDR/TP-92/18, Atlanta, GA (1993 ).