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WikiPedia: El Cajon, California http://www.dof.ca.gov/research/demographic/reports... http://www.census.gov/geo/www/gazetteer/files/Gaz_... //tools.wmflabs.org/geohack/geohack.php?language=v... http://www.ci.el-cajon.ca.us/ http://www.ci.el-cajon.ca.us/about/history.html https://web.archive.org/web/20070613005831/http://... https://web.archive.org/web/20120318033613/http://...