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WikiPedia: Gateway Arch http://www.bizjournals.com/stlouis/stories/2010/10... http://DrPanorama.com/PanoPage.aspx?TourID=680&Ima... http://www.gatewayarch.com/ http://www.gatewayarch.com/Arch/info/arch.fact.asp... http://www.greatbuildings.com/buildings/Gateway_Ar... http://pqasb.pqarchiver.com/chicagotribune/access/... http://pqasb.pqarchiver.com/csmonitor_historic/acc... http://more.stltoday.com/stltoday/news/special/gat... http://tps.cr.nps.gov/nhl/detail.cfm?ResourceId=20... http://focus.nps.gov/AssetDetail/NRIS/87001423