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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Johansen, Bruce Elliott (2003). The Dirty Dozen: Toxic Chemicals and the Earth's Future. Greenwood Publishing Group. p. 23. ISBN 0-275-97702-1. <a href="0-275-97702-1" target="_blank">0-275-97702-1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Vanderbilt, Byron Michael (1971). Thomas Edison, Chemist. American Chemical Society. p. 256. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Beazer East, Inc. (Formerly: Koppers Co. Inc.-Bridgeville)" (PDF). Environmental Protection Agency. Retrieved 2008-07-04. <a href="http://www.epa.gov/reg3wcmd/ca/pa/pdf/pad063764898.pdf" target="_blank">http://www.epa.gov/reg3wcmd/ca/pa/pdf/pad063764898.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>