Columbia subject headings:
Architectural ironwork--France--Paris--Exhibitions.
Building, Iron and steel--France--Paris--Exhibitions.
Paris (France)--Buildings, structures, etc.--Exhibitions.
Harvard subject headings:
Architecture--France--Paris
Building, Iron and steel--France--Paris--Exhibitions.
Paris (France)--Buildings, structures, etc.--Exhibitions.
Princeton subject headings:
Architecture--France--Paris.
Building, Iron and steel--France--Paris--Exhibitions.
Paris (France)--Buildings, structures, etc.--Exhibitions.