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Grainger challenge
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<h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20060915070138/http://www.nae.edu/nae/grainger.nsf">Grainger challenge page at the National Academy of Engineering</a></li> <li><a href="https://web.archive.org/web/20060615191616/http://ee.washington.edu/energy/apt/grainger/">Grainger Foundation</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Pfitzer, Kurt. "Arsenic-removal system wins NAE award". Lehigh University. Archived from the original on 27 September 2011. Retrieved 23 April 2011. <a href="https://web.archive.org/web/20110927094830/http://www3.lehigh.edu/News/RCEASnews_story.asp?iNewsID=2013" target="_blank">https://web.archive.org/web/20110927094830/http://www3.lehigh.edu/News/RCEASnews_story.asp?iNewsID=2013</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>