Columbia subject headings:
Harvard subject headings:
Greece--History--1917-1944--Congresses.
Greece--Politics and government--1935-1967--Congresses.
Spain--History--Civil War, 1936-1939--Foreign public opinion, Greek--Congresses.
Spain--History--Civil War, 1936-1939--Influence--Congresses.
Spain--History--Republic, 1931-1939--Congresses.
Princeton subject headings:
Greece--History--1917-1944--Congresses.
Greece--Politics and government--1935-1967--Congresses.
Spain--History--Civil War, 1936-1939--Foreign public opinion, Greek--Congresses.
Spain--History--Civil War, 1936-1939--Influence--Congresses.
Spain--History--Republic, 1931-1939--Congresses.