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  • Centers for Disease Control and Prevention. "Avoiding Carbon Monoxide Poisoning." Update June 25, 2007. (May 19, 2008) http://emergency.cdc.gov/disasters/psa/co.asp
  • NaturalGas.org. "Background." 2004. (May 19, 2008) http://www.naturalgas.org/overview/background.asp
  • Public Utilities Commission of Ohio. "Natural Gas Safety." (May 19, 2008) http://www.puco.ohio.gov/PUCO/Consumer/information.cfm?id=5812
  • Reuters. "Don't Dig Yourself Into a Hole, Always Call 811 Before Any Digging Project." March 31, 2008. (May 19, 2008) http://www.reuters.com/article/pressRelease/idUS236883+31- Mar-2008+PRN20080331
  • State of California Department of Services and Development. "How to Heat Your Home Efficiently and Safely."  February 2006. (May 19, 2008) http://www.csd.ca.gov/documents/Resources%20tab/Publications%20 and%20Reports/Publications/Safety%20Begins%20at%20Home.pdf