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Toxic Substance Links
Agency for Toxic Substances and Disease RegistryCenter For Research On Environmental Disease
Hazardous Substances & Public Health
Centers for Disease Control and Prevention (CDC)
National Institute of Environmental Health Sciences (NIEHS)
U.S. Environmental Protection Agency (EPA)
CIESIN (Consortium for International Earth Science Information Network)
The Chemical Industry Home Page
Minimal Risk Levels (MRLs) for Hazardous Substances