Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Relations--European Union countries--Congresses.
Europe--Economic integration--Congresses.
European Union countries--Boundaries--Congresses.
European Union countries--Relations--Europe, Eastern--Congresses.
European Union--Membership--Congresses.
Social integration--European Union countries--Congresses.
Princeton subject headings:
Europe, Eastern--Relations--European Union countries--Congresses.
Europe--Economic integration--Congresses.
European Union countries--Boundaries--Congresses.
European Union countries--Relations--Europe, Eastern--Congresses.
European Union--Membership--Congresses.
Social integration--European Union countries--Congresses.