Columbia subject headings:
Harvard subject headings:
Facades--Conservation and restoration--Italy--Florence.
Facades--Italy--Florence--Conservation and restoration.
Florence (Italy)--Buildings, structures, etc.--Conservation and restoration.
Santa Maria del Fiore (Cathedral : Florence, Italy)
Santa Maria del Fiore (Cathedral : Florence, Italy)--Conservation and restoration.
Princeton subject headings:
Church doorways--Italy--Florence.
Facades--Italy--Florence.
Florence (Italy)--Buildings, structures, etc.
Santa Maria del Fiore (Cathedral : Florence, Italy)--Facade.