Columbia subject headings:
Castilla y León (Spain)--Social conditions--20th century.
Labor disputes--Spain--Castilla y León--History--20th century.
Peasant uprisings--Spain--Castilla y León--History--20th century.
Protest movements--Spain--Castilla y León--History--20th century.
Harvard subject headings:
Castilla y León (Spain)--Social conditions--20th century.
Labor disputes--Spain--Castilla y León--History--20th century.
Peasant uprisings--Spain--Castilla y León--History--20th century.
Protest movements--Spain--Castilla y León--History--20th century.
Princeton subject headings:
Castilla y León (Spain)--History--1904, Revolution.
Castilla y León (Spain)--History--20th century.