Columbia subject headings:
Agricultural laborers--Political activity--Spain--History.
Peasants--Political activity--Spain--History.
Spain--History--20th century.
Spain--Rural conditions--20th century.
Harvard subject headings:
Agricultural laborers--Political activity--Spain--History.
Peasants--Political activity--Spain--History.
Spain--History--20th century.
Spain--Rural conditions
Princeton subject headings:
Agricultural laborers--Political activity--Spain--History.
Peasants--Political activity--Spain--History.
Spain--History--20th century.
Spain--Rural condition--20th century.