Columbia subject headings:
Communist parties--Spain--Congresses.
Nationalism--Spain--History--Congresses.
Spain--Politics and government--19th century--Congresses.
Spain--Politics and government--20th century--Congresses.
Harvard subject headings:
Communist parties--Spain--History--Congresses.
Nationalism--Spain--History--Congresses.
Right and left (Political science)--Spain--History.
Spain--Politics and government--19th century--Congresses.
Spain--Politics and government--20th century--Congresses.
Princeton subject headings:
Communist parties--Spain--History--Congresses.
Nationalism--Spain--History--Congresses.
Right and left (Political science)--Spain--History.
Spain--Politics and government--19th century--Congresses.
Spain--Politics and government--20th century--Congresses.