EPA
The Environmental Protection Agency (EPA) had a large presence at the NSTA convention, demonstrating extensive free teaching materials around drinking water standards and clean drinking water.
For more information, see EPA's Drinking Water Site.
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Brain, Marshall. "National Science Teachers Association Convention 2001." 26 March 2001. HowStuffWorks.com. <http://people.howstuffworks.com/nsta2001.htm> 23 November 2009.
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