Columbia subject headings:
Harvard subject headings:
Castilla y León (Spain)--Economic conditions--20th century.
Factories--Spain--Castilla y León--History--20th century.
Manufacturing industries--Spain--Castilla y León--History--20th century.
Spain--History--1939-1975.
Princeton subject headings:
Castilla y León (Spain)--Economic conditions--20th century.
Factories--Spain--Castilla y León--History--20th century.
Manufacturing industries--Spain--Castilla y León--History--20th century.
Spain--History--1939-1975.