Columbia subject headings:
Eastern question (Balkan)
Europe--Politics and government--1815-1848.
Russia--Foreign relations--1825-1855.
Soviet Union--Foreign relations--Turkey.
Turkey--Foreign relations--Soviet Union.
Harvard subject headings:
Eastern question (Balkan)
Europe--Politics and government--1815-1848.
Russia--Foreign relations--1825-1855.
Soviet Union--Foreign relations--Turkey.
Turkey--Foreign relations--Soviet Union.
Princeton subject headings:
Eastern question (Balkan)
Europe--Politics and government--1815-1848.
Russia--Foreign relations--1825-1855.
Soviet Union--Foreign relations--Turkey.
Turkey--Foreign relations--Soviet Union.