Columbia subject headings:
Social change--Spain--History--20th century.
Spain--Social conditions--1886-1939.
Harvard subject headings:
Middle class--Spain--20th century.
Spain--Economic conditions--20th century.
Spain--Social conditions--20th century.
Princeton subject headings:
Middle class--Spain--20th century.
Spain--Economic conditions--20th century.
Spain--Social conditions--20th century.