Building damage to the southwest corner and smoke plume from South face of WTC 7, looking from the World Financial Plaza. FEMA Initial Review into WTC collapse. 2001, Arquelio "Archie" Galarza http://www.fema.gov/pdf/library/fema403_ch5.pdf
Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.