Columbia subject headings:
Catholic Church--History--Congresses.
Christianity and politics--Catholic Church--History--Congresses.
Church and state--History--Congresses.
Monasticism and religious orders--History--Congresses.
Harvard subject headings:
Catholic Church--History--Congresses.
Christianity and politics--Catholic Church--History--Congresses.
Church and state--History--Congresses.
Monasticism and religious orders--History--Congresses.
Princeton subject headings:
Catholic Church--History--Congresses.
Christianity and politics--Catholic Church--History--Congresses.
Church and state--History--Congresses.
Monasticism and religious orders--History--Congresses.