Columbia subject headings:
Europe--Economic integration--Congresses.
European Union--Congresses.
European federation--Congresses.
Treaty on European Union Protocols, etc.
Harvard subject headings:
Constitutional law--European Union countries
European Union
European federation
Treaty on European Union Protocols, etc.
Princeton subject headings:
Europe--Economic integration--Congresses.
European Union--Congresses.
European federation--Congresses.
Treaty on European Union Protocols, etc.,