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Date: 2011-08-05 12:00:53New York City World Trade Center Port Authority of New York and New Jersey Structural engineering National Institute of Standards and Technology Masonry Concrete Steel frame Collapse of the World Trade Center Architecture Construction Building materials | Maintaining Structural Integrity Add to Reading ListSource URL: www.nist.govDownload Document from Source WebsiteFile Size: 1,25 MBShare Document on Facebook |