Columbia subject headings:
Catholic Church--Dioceses--Italy--History--Congresses.
Catholic Church--Italy--Bishops--History--Congresses.
Italy--Church history--Congresses.
Harvard subject headings:
Bishops--Italy--History.
Catholic Church--Dioceses--Italy--History--Congresses.
Catholic Church--Italy--Bishops--History--Congresses.
Italy--Church history--Congresses.
Princeton subject headings:
Catholic Church--Italy--Bishops--History--Congresses.
Catholic Church--Italy--Dioceses--History--Congresses.
Catholic Church--Italy--Government--History--Congresses.
Italy--Church history--Congresses.