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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Andrew Keller; Jack Keller; David Seckler. "Integrated Water Resource Systems: Theory and Policy Implications" (PDF). Retrieved 31 January 2020. <a href="http://www.iwmi.cgiar.org/Publications/IWMI_Research_Reports/PDF/pub003/REPORT03.PDF" target="_blank">http://www.iwmi.cgiar.org/Publications/IWMI_Research_Reports/PDF/pub003/REPORT03.PDF</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>United States. Clean Water Act, section 502(14), 33 U.S.C. § 1362. <a href="/wiki/Title_33_of_the_United_States_Code" target="_blank">/wiki/Title_33_of_the_United_States_Code</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>