Columbia subject headings:
Europe--Economic integration.
European Union--Europe, Central.
European Union--Europe, Eastern.
European Union--Membership.
European Union.
Law--European Union countries.
Harvard subject headings:
European Union
European Union--Europe, Central.
European Union--Europe, Eastern.
European Union--Membership.
Law--European Union countries
Princeton subject headings:
European Union--Europe, Central.
European Union--Europe, Eastern.
European Union--Membership.
Law--European Union countries.