Columbia subject headings:
Harvard subject headings:
European Union
European Union countries--Politics and government--21st century.
European Union countries--Public opinion.
European Union countries--Social conditions--21st century.
Public opinion--Germany--Hamburg.
Princeton subject headings:
European Union countries--Politics and government--21st century.
European Union countries--Social conditions--21st century.
European Union--Public opinion.
Public opinion--Germany--Hamburg.