Columbia subject headings:
Philosophy and religion--20th century--Congresses.
Harvard subject headings:
Civilization, Modern--20th century--Congresses
Holy, The--History of doctrines--20th century--Congresses.
Philosophy and religion--20th century--Congresses.
Princeton subject headings:
Civilization, Modern--20th century--Congresses.
Holy, The--History of doctrines--20th century--Congresses.
Philosophy and religion--20th century--Congresses.