Columbia subject headings:
Architecture--Italy--Milan.
Milan (Italy)--Buildings, structures, etc.
Milan (Italy)--Pictorial works.
Plazas--Italy--Milan--Pictorial works.
Harvard subject headings:
Architecture--Italy--Milan--Pictorial works.
Milan (Italy)--Buildings, structures, etc.
Milan (Italy)--Pictorial works.
Plazas--Italy--Milan--Pictorial works.
Princeton subject headings:
Architecture--Italy--Milan.
Milan (Italy)--Buildings, structures, etc.
Milan (Italy)--Description--Views.
Plazas--Italy--Milan--Pictorial works.