Columbia subject headings:
Balkan Peninsula--Foreign relations--20th century.
Balkan Peninsula--Foreign relations--Historiography.
Balkan Peninsula--Historiography.
Balkan Peninsula--Politics and government--20th century.
Harvard subject headings:
Balkan Peninsula--Foreign relations--20th century.
Balkan Peninsula--Historiography.
Balkan Peninsula--Politics and government--20th century.
Princeton subject headings: