Acute Toxicity Database http://www.cerc.cr.usgs.gov/data/acute/acute.html
Statistical approaches for taxonomic comparisons, and factors such as age, pH, temperature, water hardness, and diet affecting toxicological outcome. Maintained by the Columbia Environmental Research Center, Missouri.
Tetratox http://www.vet.utk.edu/TETRATOX/
Database of toxic potency data for more than 2,100 industrial organic compounds maintained by the College of Veterinary Medicine, University of Tennessee, Knoxville.