Columbia subject headings:
Balkan Peninsula--History--19th century--Congresses.
Eastern question (Balkan)--Congresses.
Russo-Turkish War, 1877-1878--Congresses.
Harvard subject headings:
Balkan Peninsula--History--19th century--Congresses.
Balkan Peninsula--History--Congresses.
Eastern question (Balkan)--Congresses.
Russo-Turkish War, 1877-1878--Congresses.
Princeton subject headings:
Balkan Peninsula--History--Congresses.
Eastern question (Balkan)--Congresses.
Russo-Turkish War, 1877-1878--Congresses.