Columbia subject headings:
Europe--Economic integration--Congresses.
European Union countries--Foreign relations--Congresses.
European Union countries--Politics and government--Congresses.
European Union--Congresses.
Harvard subject headings:
Europe--Economic integration--Congresses.
European Union countries--Foreign relations--Congresses.
European Union countries--Politics and government--Congresses.
European Union--Congresses.
Princeton subject headings:
Europe--Economic integration--Congresses.
European Union countries--Foreign relations--Congresses.
European Union countries--Politics and government--Congresses.
European Union--Congresses.