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  • Environmental Protection Agency. “Water Quality Standards.” Downloaded March 4, 2008. Available on the web at
  • http://www.epa.gov/waterscience/standards/about/
  • George Constable and Bob Somerville. A Century of Innovation: Twenty Engineering Achievements that Transformed Our Lives. Joseph Henry Press, Washington, D.C., 2003.
  • Henry Petroski. Pushing the Limits: New Adventures in Engineering. Knopf, New York, 2004.
  • NRC (National Research Council). Our Common Journey: A Transition Toward Sustainability. National Academy Press, Washington, D.C., 1999.
  • John Snow Archive and Research Companion. MATRIX: The Center for Humane Arts, Letters, and Social Sciences Online at Michigan State University. Downloaded May 28, 2008. Available on the web at
  • http://matrix.msu.edu/~johnsnow/
  • World Health Organization. “Cholera: Prevention and Control.” Downloaded July 2008. Available on the web at
  • http://www.who.int/topics/cholera/control/en/

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