Columbia subject headings:
Communism--Spain.
Partido Comunista de España--History.
Spain--History--Republic, 1931-1939.
Harvard subject headings:
Communism--Spain--History
Partido Comunista de España--History.
Spain--History--Republic, 1931-1939.
Princeton subject headings:
Communism--Spain--History--20th century.
Partido Comunista de España--History.
Spain--History--Republic, 1931-1939.