Columbia subject headings:
New York (N.Y.)--Buildings, structures, etc.
Skyscrapers--Design and construction.
World Trade Center (New York, N.Y. : 1970-2001)--Designs and plans.
World Trade Center (New York, N.Y. : 1970-2001)--Explosions.
World Trade Center Site (New York, N.Y.)
Harvard subject headings:
Princeton subject headings:
New York (N.Y.)--Buildings, structures, etc.
Skyscrapers--Design and construction.
World Trade Center (New York, N.Y.)--Designs and plans.
World Trade Center (New York, N.Y.)--Explosions.
World Trade Center Site (New York, N.Y.)