Columbia subject headings:
Christian art and symbolism--Italy--Orvieto.
Church architecture--Italy--Orvieto.
Harvard subject headings:
Catholic Church. Diocese of Orvieto (Italy)--History.
Christian art and symbolism--Italy--Orvieto.
Church architecture--Italy--Orvieto.
Orvieto (Italy)--Buildings, structures, etc.
Sculpture, Italian--Italy--Orvieto.
Sculpture, Medieval--Italy--Orvieto.
Princeton subject headings: