Columbia subject headings:
Balkan Peninsula--Foreign relations--Soviet Union.
Balkan Peninsula--History.
Russo-Turkish War, 1877-1878.
Soviet Union--Foreign relations--Balkan Peninsula.
Harvard subject headings:
Balkan Peninsula--Foreign relations--Soviet Union.
Balkan Peninsula--History--19th century.
Russo-Turkish War, 1877-1878.
Soviet Union--Foreign relations--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--Foreign relations--Russia.
Balkan Peninsula--History.
Russia--Foreign relations--Balkan Peninsula.
Russo-Turkish War, 1877-1878.