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By Stephen Smith
CBSNews.com
Bonnie Giebfried desperately gasped for breath on the morning of Sept. 11, 2001.
The emergency medical technician and two dozen others had just been buried alive in the 1 World Financial Center building at the World Trade Center.
A fireball had sucked a mountain of smoldering debris on top of them. Entombed in rubble, they were unable to break the window panes that led to oxygen outside. ...