| Bibliography |
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Self, J.R.. "Nitrates in Drinking Water." Extension. 10/08. Colorado State University. <http://www.ext.colostate.edu/PUBS/crops/00517.html>.
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Mayell, Hillary. "Streams Reduce Nitrogen Pollution, Scientists Find." National Geographic News. May 4,2001. National Geographic. <http://news.nationalgeographic.com/news/2001/05/0504_smallstreams.html>.