Columbia subject headings:
France--Politics and government--1914-1940--Congresses.
Popular fronts--France--History--20th century--Congresses.
Popular fronts--Spain--History--20th century--Congresses.
Spain--Politics and government--1931-1939--Congresses.
Harvard subject headings:
France--Politics and government--1914-1940--Congresses.
Popular fronts--France--History--20th century--Congresses.
Popular fronts--Spain--History--20th century--Congresses.
Spain--Politics and government--1931-1939--Congresses.
Princeton subject headings:
France--Politics and government--1914-1940--Congresses.
Popular fronts--France--History--20th century--Congresses.
Popular fronts--Spain--History--20th century--Congresses.
Spain--Politics and government--1931-1939--Congresses.