Columbia subject headings:
Eastern question.
Russia--Foreign relations--1801-1825.
Russia--Foreign relations--1825-1855.
Harvard subject headings:
Eastern question (Balkan)
Europe--Politics and government--1815-1848.
Russia--Foreign relations--Turkey.
Turkey--Foreign relations--Russia.
Princeton subject headings:
Eastern question.
Russia--Foreign relations--1801-1825.
Russia--Foreign relations--1825-1855.