Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Economic conditions.
Balkan Peninsula--Foreign relations--European Union countries.
Balkan Peninsula--History.
Balkan Peninsula--Politics and government.
European Union countries--Foreign relations--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--Economic conditions.
Balkan Peninsula--Foreign relations--European Union countries.
Balkan Peninsula--History.
Balkan Peninsula--Politics and government.
European Union countries--Foreign relations--Balkan Peninsula.