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DALLAS, TX - APRIL 24:  Steel beams from the World Trade Center are dispalyed in the 9/11 terrorist attacks portion of the George W. Bush Presidential Center on the campus of Southern Methodist University on April 24, 2013 in Dallas, Texas. Dedication of the George W. Bush Presidential Library is to take place on April 25 with all five living U.S. Presidents in attendance.  (Photo by Kevork Djansezian/Getty Images) Kevork Djansezian/Getty