Columbia subject headings:
Orvieto (Italy)--Antiquities.
Orvieto (Italy)--History.
Harvard subject headings:
Cities and towns, Ancient--Italy.
Etruscans--Italy--Orvieto.
Orvieto (Italy)--Antiquities.
Princeton subject headings:
Orvieto (Italy)--Antiquities.
Orvieto (Italy)--History.