Columbia subject headings:
Harvard subject headings:
Employers' associations--Spain--History--20th century.
Industrial relations--Spain
Labor unions--Spain--History--20th century.
Spain--Economic conditions--1918-1975.
Spain--Politics and government--1931-1939.
Working class--Spain
Princeton subject headings:
Employers' associations--Spain--History--20th century.
Industrial relations--Spain--History--20th century.
Labor unions--Spain--History--20th century.