Columbia subject headings:
Building failures--Investigation--New York (State)--New York.
Buildings--Evacuation--Standards.
September 11 Terrorist Attacks, 2001.
Skyscrapers--Fires and fire prevention--Standards.
Structural stability--Standards.
World Trade Center (New York, N.Y. : 1970-2001)
Harvard subject headings:
Building failures--Investigation--New York (State)--New York.
Buildings--Evacuation--Standards.
September 11 Terrorist Attacks, 2001.
Skyscrapers--Fires and fire prevention--Standards.
Structural stability--Standards.
World Trade Center (New York, N.Y.)
Princeton subject headings:
Building failures--Investigation--New York (State)--New York.
Buildings--Evacuation--Standards.
September 11 Terrorist Attacks, 2001.
Skyscrapers--Fires and fire prevention--Standards.
Structural stability--Standards.
World Trade Center (New York, N.Y.)