» Acute Toxicity Database    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.    http://www.cerc.usgs.gov/data/acute/acute.html

» Distributed Structure-Searchable Toxicity Database Network    DSSTox provides a community forum for publishing standard format, structure-annotated toxicity data files for open public access. Offers search based on chemical formula, maintained by the Environment Protection Agency, USA.    http://www.epa.gov/nheerl/dsstox/

» Registry of Toxic Effects of Chemical Substances    Information about the database of toxicological information compiled, maintained, and updated by the National Institute for Occupational Safety and Health.    http://www.cdc.gov/niosh/rtecs/

» 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.    http://www.vet.utk.edu/TETRATOX/

» Toxicology and Environmental Health Information    Databases and resources related to toxicity, hazardous chemicals and ecological hazards, at National Library of Medicine, Bethesda, Maryland.    http://www.sis.nlm.nih.gov/Tox/ToxMain.html

» Toxicology sites    Toxicology sites maintained by Dr. Hardin, at University of Iowa.    http://www.lib.uiowa.edu/hardin/md/tox.html