Columbia subject headings:
Harvard subject headings:
European Union countries--Foreign economic relations--Congresses.
European Union countries--Foreign relations--Congresses.
European Union--Emigration and immigration--Congresses.
European Union--Foreign relations--Congresses.
Princeton subject headings:
European Union countries--Foreign economic relations--Congresses.
European Union countries--Foreign relations--Congresses.
European Union--Emigration and immigration--Congresses.
European Union--Foreign relations--Congresses.