Columbia subject headings:
Balkan Peninsula--Civilization.
Balkan Peninsula--History--19th century--Congresses.
Balkan Peninsula--Relations--Russia--Congresses.
Russia--Relations--Balkan Peninsula--Congresses.
Slavs, Southern--History--Congresses.
Harvard subject headings:
Balkan Peninsula--Civilization.
Balkan Peninsula--History--19th century--Congresses.
Balkan Peninsula--Relations--Russia--Congresses.
Nationalism--Yugoslavia--History--19th century--Congresses.
Russia--Relations--Balkan Peninsula--Congresses.
Russia--Relations--Yugoslavia--Congresses.
Slavs, Southern--History--Congresses.
Yugoslavia--History--Congresses.
Yugoslavia--Relations--Russia--Congresses.
Princeton subject headings: