Columbia subject headings:
Harvard subject headings:
Corporate state--Portugal--History--20th century.
Industrial relations--Portugal--History--20th century.
Labor policy--Portugal--History--20th century.
Labor unions--Portugal--History--20th century.
Portugal--Social policy.
Princeton subject headings:
Labor unions--Portugal--History.
Portugal--Politics and government--1910-1974.
Working class--Portugal--Social conditions.
Working class--Portugal.