Columbia subject headings:
Building failures--New York (State)--New York.
September 11 Terrorist Attacks, 2001.
World Trade Center (New York, N.Y. : 1970-2001)
Harvard subject headings:
Building failures--New York (State)--New York.
September 11 Terrorist Attacks, 2001.
World Trade Center (New York, N.Y.)
Princeton subject headings:
Building failures--New York (State)--New York.
September 11 Terrorist Attacks, 2001.
World Trade Center (New York, N.Y.)