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  • 911veritas. "Building the World Trade Center." Port Authority of New York and New Jersey via YouTube. (Sept. 8, 2011) http://www.youtube.com/watch?v=__gUjUv1vvw
  • Buyukozturk, Franz-Josef Ulm and Oral. "Materials and structure." Massachusetts Institute of Technology (Sept. 8, 2011)
  • Eagar, Christopher Musso and Thomas. "Why Did the World Trade Center Collapse? Science, Engineering and Speculation." JOM. 2001. (Sept. 8, 2011) http://www.tms.org/pubs/journals/JOM/0112/Eagar/Eagar-0112.html#ref5
  • FEMA. "World Trade Center Building Performance Study: Data Collection, Preliminary Observations, and Recommendations." September 2002. (Sept. 8, 2011)
  • Gayle, Frank W., et al. "The structural steel of the World Trade Center towers." Advanced Materials and Processes." Oct. 1, 2004. (Sept. 8, 2011) http://www.highbeam.com/doc/1G1-123583397.html
  • Ross, David Johnson and Shmuel. "World Trade Center History: Magnificent Buildings Graced Skyline." infoplease. (Sept. 8, 2011) http://www.infoplease.com/spot/wtc1.html
  • The Skyscraper Museum. "World Trade Center." (Sept. 8, 2011) http://www.skyscraper.org/EXHIBITIONS/BIG_BUILDINGS/CONTENT/jumbos/j_09.htm
  • Tyson, Peter. "Twin Towers of Innovation." Nova. April 30, 2002. (Sept. 8, 2011) http://www.pbs.org/wgbh/nova/tech/twin-towers-of-innovation.html
  • United States Search and Rescue Task Force. "Word Trade Center Disaster." (Sept. 8, 2011) http://www.ussartf.org/world_trade_center_disaster.htm