Columbia subject headings:
Harvard subject headings:
Double cathedrals--Italy--Milan.
Milan (Italy)--Buildings, structures, etc.
Milan (Italy)--Church history.
Santa Maria Maggiore (Basilica : Milan, Italy)
Santa Tecla (Basilica : Milan, Italy)
Princeton subject headings:
Duomo di Milano.
Milan (Italy)--Buildings, structures, etc.
Milan (Italy)--Church history.