Columbia subject headings:
Building--Italy--Milan--History.
Cathedrals--Italy--Milan.
Duomo di Milano--History.
Milan (Italy)--Buildings, structures, etc.
Harvard subject headings:
Cathedrals--Italy--Milan--History.
Church buildings--Italy--Milan--History.
Duomo di Milano--History.
Princeton subject headings:
Cathedrals--Italy--Milan--History.
Church buildings--Italy--Milan--History.
Duomo di Milano--History.