U.S. Environmental Protection Agency
   http://www.epa.gov/

   U.S. Department of Transportation
   http://www.dot.gov/new/index.htm

   Occupational Safety & Health Organization
   http://www.osha.gov/

   NIOSH Pocket Guide to Chemical Hazards
   http://www.cdc.gov/niosh/npg/

   MSDS Search Engine
   http://www.msdssearch.com/

   Toxics Release Inventory (TRI) Program
   http://epa.gov/tri/

   U.S. EPA - Region VII
   http://www.epa.gov/Region7/

   NE Dept. of Environmental Quality
   http://www.deq.state.ne.us/