Columbia subject headings:
Art--Italy--Orvieto.
Christian art and symbolism--Italy--Orvieto.
Duomo di Orvieto (Orvieto, Italy)
Mural painting and decoration--Italy--Orvieto.
Orvieto (Italy)--Buildings, structures, etc.
Harvard subject headings:
Art--Italy--Orvieto.
Christian art and symbolism--Italy--Orvieto.
Church architecture--Italy--Orvieto.
Church decoration and ornament--Italy--Orvieto.
Duomo di Orvieto.
Mural painting and decoration--Italy--Orvieto.
Orvieto (Italy)--Buildings, structures, etc.
Princeton subject headings:
Church decoration and ornament--Italy.
Duomo di Orvieto (Orvieto, Italy)
Orvieto (Italy)--Buildings, structures, etc.