Columbia subject headings:
Citizenship--Portugal.
Immigrants--Government policy--Portugal.
Portugal--Emigration and immigration.
Harvard subject headings:
European Union countries--Relations--Portugal.
Portugal--Civilization--20th century.
Portugal--Politics and government--1974-
Portugal--Relations--European Union countries.
Portugal--Social conditions--20th century.
Princeton subject headings:
European Union countries--Relations--Portugal.
Portugal--Civilization--20th century.
Portugal--Politics and government--1974-
Portugal--Relations--European Union countries.
Portugal--Social conditions--20th century.