"The World Trade Center: Rise and Fall of an American Icon" discusses the planning, construction, collapse, recovery, and cleanup of the buildings in the aftermath of their destruction by an act of Islamic terrorism.
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Col. John O'Dowd (U.S. Army Corps of Engineers)
In Oklahoma City you could see pieces of desks and chairs and there was something that told you this was an office building. At the World Trade Center site it seems that everything was pulverized.