Columbia subject headings:
Harvard subject headings:
Communist parties--Spain--Catalonia--History--20th century.
Essays.
Labor movement--Spain--Catalonia--History--20th century.
Nin, Andrés, 1892-1937.
Partido Obrero de Unificación Marxista--History.
Princeton subject headings:
Essays.
Labor movement--Spain--History--20th century.
Nin, Andrés, 1892-1937.
Partido Obrero de Unificación Marxista--History--20th century.