Columbia subject headings:
Architecture, Romanesque--Italy--Umbria.
Church architecture--Italy--Umbria.
Church architecture--Italy.
Harvard subject headings:
Architecture, Romanesque--Italy--Umbria.
Art, Romanesque--Italy--Umbria.
Church architecture--Italy--Umbria.
Church architecture--Italy.
Princeton subject headings:
Architecture, Romanesque--Italy--Umbria.
Art, Romanesque--Italy--Umbria.
Church architecture--Italy--Umbria.