Columbia subject headings:
Leeuw, G. van der (Gerardus), 1890-1950--Congresses.
Religion and culture--Congresses.
Religion--Philosophy--Congresses.
Harvard subject headings:
Leeuw, G. van der (Gerardus), 1890-1950--Congresses.
Religion and culture--Congresses
Religion--Congresses
Religion--Study and teaching--Congresses.
Princeton subject headings: