Columbia subject headings:
Harvard subject headings:
Architecture--Competitions
City planning--New York (State)--New York--History--21st century.
Memorial--Competition--New York (State)--New York.
September 11 Terrorist Attacks, 2001.
Symbolism in architecture--New York (State)--Exhibitions.
World Trade Center Site (New York, N.Y.)--Planning.
Princeton subject headings:
Architecture--New York (State)--New York--21st century--Competition.
City planning--New York (State)--New York--History--21st century.
Manhattan (New York, N.Y.)--Buildings, structures, etc.
Memorials--New York (State)--New York--Designs and plans.
New York (N.Y.)--Buildings, structures, etc.
World Trade Center Site (New York, N.Y.)