Columbia subject headings:
Catholic Church--Italy--History--19th century--Congresses.
Catholic Church--Italy--History--20th century--Congresses.
Church and state--Italy--History--19th century--Congresses.
Church and state--Italy--History--20th century--Congresses.
Harvard subject headings:
Catholic Church--Italy--History--19th century--Congresses.
Catholic Church--Italy--History--20th century--Congresses.
Church and state--Italy--History--19th century--Congresses.
Church and state--Italy--History--20th century--Congresses.
Princeton subject headings:
Catholic Church--Italy--Congresses.
Church and state--Italy--History--19th century--Congresses.
Church and state--Italy--History--20th century--Congresses.