Columbia subject headings:
Gubbio (Italy)--Buildings, structures, etc.--History--Sources.
Piazza San Giovanni (Gubbio, Italy)--History--Sources.
Plazas--Italy--Gubbio--History--Sources.
Harvard subject headings:
Princeton subject headings:
Architecture--Italy--Gubbio--History.
Gubbio (Italy)--Buildings, structures, etc.
Piazza San Giovanni (Gubbio, Italy)
Plazas--Italy--Gubbio--History.