Columbia subject headings:
Europe--Economic conditions--21st century.
Europe--Foreign relations--21st century.
Europe--Politics and government--21st century.
Harvard subject headings:
Europe--Economic conditions--21st century.
Europe--Foreign relations--21st century.
Europe--Politics and government--21st century.
European Union countries--Politics and government--21st century.
European Union--Public opinion.
Princeton subject headings:
Europe--Economic conditions--21st century.
Europe--Foreign relations--21st century.
Europe--Politics and government--21st century.