Fire Protection and Life Safety Provisions Applied to the Design and Construction of WTC 1, 2 and 7 and Post-Construction Provisions Applied After Occupancy. Federal Building and Fire Safety Investigation of the World Trade Center (NIST NCSTAR 1-1D)

R A. Grill; D A. Johnson

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.