Columbia subject headings:
Catalonia (Spain)--History--20th century.
Communism--Spain--Catalonia--History.
Partido Obrero de Unificación Marxista.
Spain--History--Civil War, 1936-1939.
Harvard subject headings:
Catalonia (Spain)--History--20th century.
Communism--Spain--Catalonia--History.
Partido Obrero de Unificación Marxista.
Spain--History--Civil War, 1936-1939.
Princeton subject headings:
Barcelona (Spain)--History--20th century.
Spain--History--Civil War, 1936-1939.