Columbia subject headings:
Hammarskjöld, Dag, 1905-1961--Congresses.
United Nations--Congresses.
Harvard subject headings:
Hammarskjöld, Dag, 1905-1961--Congresses.
International relations--History--Congresses.
United Nations--History--Congresses.
Princeton subject headings:
Hammarskjöld, Dag, 1905-1961--Congresses.
International relations--History--Congresses.
United Nations--History--Congresses.