References
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Jensen, Derrick, and Aric McBay. What We Leave Behind. New York: Seven Stories Press, 2009.
Magazine, Discover. 20 Things You Didn't Know. http://discovermagazine.com/columns/20-things-you-didnt-know (accessed July 2009).
U.S. Environmental Protection Agency. Wastes - Resource Conservation - Common Wastes & Materials. http://www.epa.gov/waste/conserve/materials/plastics.htm (accessed July 12, 2009).
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