Columbia subject headings:
Harvard subject headings:
International relations--Congresses
Social systems--History--20th century--Congresses.
World War, 1914-1918--Influence--Congresses.
World politics--1900-1945--Congresses.
Princeton subject headings:
International relations--Congresses.
Social systems--History--20th century--Congresses.
World War, 1914-1918--Influence--Congresses.
World politics--1900-1945--Congresses.