Columbia subject headings:
European Union--Portugal.
European Union--Spain.
Portugal--Relations--Spain.
Portugal--Social conditions.
Spain--Relations--Portugal.
Spain--Social conditions.
Harvard subject headings:
European Union--Politics and government.
Portugal--Politics and government.
Spain--Politics and government.
Princeton subject headings:
European Union--Portugal.
European Union--Spain.
Portugal--Relations--Spain.
Portugal--Social conditions.
Spain--Relations--Portugal.
Spain--Social conditions.