Columbia subject headings:
Architecture, Gothic--Italy.
Duomo di Orvieto (Orvieto, Italy)
Harvard subject headings:
Architecture, Gothic--Italy.
Church architecture--Italy--Orvieto.
Church decoration and ornament--Italy--Orvieto.
Duomo di Orvieto (Orvieto, Italy)
Orvieto (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Gothic--Italy.
Orvieto. Santa Maria della Stella (Cathedral)