Columbia subject headings:
Harvard subject headings:
New York (N.Y.)--Buildings, structures, etc.--Pictorial works
Skyscrapers--New York (State)--New York--Pictorial works.
World Trade Center (New York, N.Y.)--Pictorial works.
Princeton subject headings:
New York (N.Y.)--Buildings, structures, etc.
Skyscrapers--New York (State)--New York.
World Trade Center (New York, N.Y.)