Columbia subject headings:
Constitutional law--European Union countries--Congresses.
European Union countries--Territorial expansion--Congresses.
European Union--Congresses.
International and municipal law--Europe, Central.
International and municipal law--Europe, Eastern.
International and municipal law--European Union countries.
Harvard subject headings:
Constitutional law--European Union countries--Congresses
European Union--Congresses.
International and municipal law--European Union countries--Congresses.
Princeton subject headings: