Columbia subject headings:
Harvard subject headings:
Europe--Economic integration--Public opinion.
Europe--Foreign relations--21st century.
Europe--Politics and government--21st century
European Union
European Union--Germany--Public opinion.
European Union--Poland--Public opinion.
Germany--Foreign relations--Poland
Poland--Foreign relations--Germany
Populism--Europe--Public opinion.
Princeton subject headings:
Europe--Economic integration.
European Union--Germany--Public opinion.
European Union--Poland--Public opinion.
European Union.