Columbia subject headings:
Harvard subject headings:
Economic development--Portugal--Porto--History--21st century.
European Union--Portugal.
Porto (Portugal)--Economic conditions--21st century.
Porto (Portugal)--Social conditions--21st century.
Princeton subject headings:
Economic development--Portugal--Porto--History--21st century.
European Union--Portugal.
Porto (Portugal)--Economic conditions--21st century.
Porto (Portugal)--Social conditions--21st century.