Columbia subject headings:
Cathedrals--Italy--Siena--Guidebooks.
Duomo di Siena--Guidebooks.
Harvard subject headings:
Church architecture--Italy--Siena.
Church decoration and ornament--Italy--Siena.
Duomo di Siena.
Museo dell'Opera del Duomo (Siena, Italy)
Siena (Italy)--Buildings, structures, etc.
Princeton subject headings:
Church architecture--Italy--Siena.
Church decoration and ornament--Italy--Siena.
Duomo di Siena.
Museo dell'Opera del Duomo (Siena, Italy)
Siena (Italy)--Buildings, structures, etc.