Columbia subject headings:
European Union countries--Economic policy.
European Union countries--Foreign economic relations--Poland.
European Union--Poland.
European federation.
Poland--Foreign economic relations--European Union countries.
Harvard subject headings:
European Union countries--Relations--Poland.
European Union--Membership.
European Union--Poland.
Poland--Relations--European Union countries.
Princeton subject headings:
European Union--Membership.
European Union--Poland.