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WikiPedia: Delta,_Colorado http://zip4.usps.com/zip4/citytown.jsp http://www.colorado.gov/dpa/doit/archives/muninc.h... http://www.delta-co.gov/ http://www.delta-co.gov/city_council.htm //tools.wmflabs.org/geohack/geohack.php?language=v... http://www.dola.state.co.us/dlg/local_governments/... https://web.archive.org/web/20070905155118/http://... https://web.archive.org/web/20091212060308/http://...