Columbia subject headings:
Spain--History--19th century.
Spain--History--20th century.
Spain--Social conditions--19th century.
Spain--Social conditions--20th century.
Harvard subject headings:
Spain--History--19th century.
Spain--History--20th century.
Spain--Social conditions--19th century.
Spain--Social conditions--20th century.
Princeton subject headings:
Spain--History--19th century.
Spain--History--20th century.
Spain--Social conditions--19th century.
Spain--Social conditions--20th century.