Columbia subject headings:
Art--History--Congresses.
Warburg, Aby, 1866-1929--Congresses.
Harvard subject headings:
Warburg, Aby, 1866-1929--Congresses.
Warburg, Aby, 1866-1929--Criticism and interpretation--Congresses.
Princeton subject headings:
Warburg, Aby, 1866-1929--Criticism and interpretation--Congresses.