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WikiPedia: Tigard, Oregon http://www.pdx.edu/media/p/r/PRC_Certified_Cities_... http://www.tigard-or.gov/ http://www.tigard-or.gov //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... http://www.bluebook.state.or.us/local/populations/... https://web.archive.org/web/20080626050305/http://...