Columbia subject headings:
Catholic Church--Doctrines--History--20th century--Congresses.
Christianity and culture--History of doctrines--20th century--Congresses.
Developing countries--Church history--20th century--Congresses.
Harvard subject headings:
Catholic Church--Doctrines--History--20th century.
Christianity and culture--History of doctrines--20th century.
Developing countries--Church history--20th century.
Princeton subject headings: