1. Agency for Toxic Substances and Disease Registry. Hazardous Substances Emergency Events Surveillance. Historic website. Available at: http://www.atsdr.cdc.gov/HS/HSEES/index.html . Accessed 8/6/2010
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3. National Response Center. NRC Background website. Available at: http://www.nrc.uscg.mil/nrcback.html . Accessed 8/6/2010
4. US Department of Transportation. Pipeline and Hazardous Materials Safety Administration. Incident reporting website. Available at: http://www.phmsa.dot.gov/incident-report . Accessed 8/6/2010
5. Agency for toxic Substances and Disease Registry. Rapid response registry website. Available at: https://www.rapidresponseregistry.org/ . Accessed 8/6/2010