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  1. Timeline of the September 11 attacks

    The following timeline is a chronological list of all the major events leading up to, during, and immediately following the September 11 attacks against the United States in 2001, through the first anniversary of the attacks in 2002. Wikipedia

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  3. en.wikipedia.org

    Diagram showing floor truss system and concrete floor over steel pans The towers were designed as framed tube structures, which provided tenants with open floor plans uninterrupted by columns or walls. The buildings were square and 207 ft (63 m) on each side but had chamfered 6 ft 11 in (2.11 m) corners, making each building's exterior roughly 210 ft (64 m) wide. [22] One World Trade Center ...
  4. timeline.911memorial.org

    Within hours of the September 11, 2001 attacks, millions of people across the world felt compelled to respond to the crisis. Volunteers and trained professionals from near and far rushed to help in the rescue and recovery efforts at the World Trade Center, Pentagon, and Flight 93 sites.
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