Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Foreign relations--European Union countries--Congresses.
Europe--History--20th century--Congresses.
Europe--Politics and government--20th century--Congresses.
European Union countries--Foreign relations--Europe, Eastern--Congresses.
European Union--Membership--Congresses.
European federation--Congresses
Princeton subject headings:
Europe, Eastern--Foreign relations--European Union countries--Congresses.
European Union countries--Foreign relations--Europe, Eastern--Congresses.
European Union--Membership--Congresses.