Columbia subject headings:
Catholic Church--France--History--Congresses.
Catholic Church--Italy--History--Congresses.
France--Church history--Congresses.
France--Relations--Italy--Congresses.
Italy--Church history--Congresses.
Italy--Relations--France--Congresses.
Harvard subject headings:
Catholic Church--France--History--Congresses.
Catholic Church--Italy--History--Congresses.
France--Church history--Congresses.
France--Relations--Italy--Congresses.
Italy--Church history--Congresses.
Italy--Relations--France--Congresses.
Princeton subject headings: