Columbia subject headings:
Decoration and ornament, Architectural--Italy--Siena.
Decoration and ornament, Medieval--Italy--Siena.
Duomo di Siena.
Sculpture, Italian--Italy--Siena.
Sculpture, Medieval--Italy--Siena.
Siena (Italy)--Buildings, structures, etc.
Stone carving--Italy--Siena.
Harvard subject headings:
Decoration and ornament, Architectural--Italy--Siena.
Decoration and ornament, Medieval--Italy--Siena.
Duomo di Siena.
Sculpture, Italian--Italy--Siena.
Sculpture, Medieval--Italy--Siena.
Siena (Italy)--Buildings, structures, etc.
Stone carving--Italy--Siena.
Princeton subject headings:
Duomo di Siena.
Sculpture, Italian--Italy--Siena.