& West Street in downtown Dallas, the welcome became more roused . At the extreme west end of Main Street the motorcade turned right on Houston Street and proceeded North for one block in order to make a left turn on Elm Street the most direct and convenient approach to the Stemmons Freeway and the Trade Mart building. As the President's car approached the intersection of Houston and Elm, loomed directly ahead on the intersection's northwest corner a seven-story red brick warehouse and office building, the Texas School Book Depository (www.nara.com).
             Riding in the Vice President's car, Agent Rufus W. Youngblood of the Secret Service noticed that the clock atop the building indicated 12:30 p.m., the scheduled arrival time at the Trade Mart. The President's car, which had been going north, made a sharp turn toward the southwest onto Elm Street. At a speed of about 11 miles per hour, it started down the gradual descent toward a railroad overpass under which the motorcade would proceed before reaching the Stemmons Free
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