Columbia subject headings:
Harvard subject headings:
Architecture--Italy--Umbria.
Building materials--Italy--Umbria.
Building stones--Italy--Umbria.
Decoration and ornament, Architectural--Italy--Umbria.
Stone buildings--Italy--Umbria.
Princeton subject headings:
Building, Stone--Italy--Umbria.
Stone carving--Italy--Umbria.
Stone--Italy--Umbria.