Columbia subject headings:
Communism--Spain--History.
P.S.O.E. (Political party)--History.
Partido Comunista de España--History.
Socialism--Spain--History.
Harvard subject headings:
Communism--Spain
Communism--Spain--History
P.S.O.E. (Political party)--History.
Partido Comunista de España
Partido Comunista de España--History.
Socialism--Spain--History
Spain--Politics and government.
Princeton subject headings:
Communism--Spain.
Partido Comunista de España--History.
Socialism--Spain.
Spain--Politics and government--1939-1975.
Spain--Politics and government--1975-.