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Date: 2012-06-14 08:00:34World Trade Center Structural system Port Authority of New York and New Jersey Framing Stairway Observation deck Storey Empire State Building Ironworker Architecture New York City Construction | Microsoft PowerPoint - 1WTC Fact Sheet_MH versionAdd to Reading ListSource URL: onewtc.comDownload Document from Source WebsiteFile Size: 125,62 KBShare Document on Facebook |