FEMA report, http://www.fema.gov/pdf/library/fema403_ch1.pdf, PD-USA, 9/11 twin towers wtc world trade center. Credited to the en:Office of Emergency Management.
Originally from en.wikipedia; description page is/was here.
2006-11-15 (original upload date)
Original uploader was Sugplumxx at en.wikipedia
(All user names refer to en.wikipedia)
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