Columbia subject headings:
Christian antiquities--Italy--Umbria--Congresses.
Church architecture--Italy--Umbria.
Umbria (Italy)--Antiquities, Roman--Congresses.
Harvard subject headings:
Christian antiquities--Italy--Umbria--Congresses.
Umbria (Italy)--Antiquities, Roman--Congresses.
Umbria (Italy)--Antiquities--Congresses.
Umbria (Italy)--History--Congresses.
Princeton subject headings:
Umbria (Italy)--Antiquities--Congresses.
Umbria (Italy)--History--Congresses.