Columbia subject headings:
Architecture, Renaissance--Conservation and restoration--Italy--Vigevano.
Piazza ducale (Vigevano, Italy)--History.
Harvard subject headings:
Piazza ducale (Vigevano, Italy)
Plazas--Conservation and restoration--Italy--Vigevano.
Princeton subject headings:
Piazza ducale (Vigevano, Italy)
Plazas--Conservation and restoration--Italy--Vigevano.