Columbia subject headings:
Europe, Eastern--Foreign relations--1989-
Europe, Eastern--Foreign relations--1989---Case studies.
European Union--Membership--Case studies.
European Union--Membership.
North Atlantic Treaty Organization--Membership--Case studies.
North Atlantic Treaty Organization--Membership.
Harvard subject headings:
Europe, Eastern--Foreign relations--1989-
Europe, Eastern--Foreign relations--1989---Case studies.
European Union--Membership--Case studies.
European Union--Membership.
North Atlantic Treaty Organization--Membership--Case studies.
North Atlantic Treaty Organization--Membership.
Princeton subject headings:
Case studies.
Europe, Eastern--Foreign relations--1989-
Europe, Eastern--Foreign relations--1989---Case studies.
European Union--Membership--Case studies.
European Union--Membership.
North Atlantic Treaty Organization--Membership--Case studies.
North Atlantic Treaty Organization--Membership.