Columbia subject headings:
Harvard subject headings:
Labor unions--Portugal--History--Sources.
Portugal--Politics and government--1933-1974--Sources.
Strikes and lockouts--Portugal--History--Sources.
Wages--Portugal--History--Sources.
Working class--Portugal--History--Sources.
Princeton subject headings:
Labor unions--Portugal--History--Sources.
Labor--Portugal--History--Sources.
Portugal--Politics and government--1933-1974--Sources.
Strikes and lockouts--Portugal--History--Sources.
Wages--Portugal--History--Sources.