Columbia subject headings:
Harvard subject headings:
Happiness--Congresses.
Lewis, C. S. (Clive Staples), 1898-1963--Criticism and interpretation--Congresses.
Love--Congresses
Pieper, Josef, 1904-1997--Criticism and interpretation--Congresses.
Princeton subject headings:
Lewis, C. S. (Clive Staples), 1898-1963--Criticism and interpretation--Congresses.
Pieper, Josef, 1904-1997--Criticism and interpretation--Congresses.