Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--Turkey.
Europe--Politics and government--1815-1848.
Turkey--Foreign relations--Europe.
Turkey--Politics and government--1829-1878.
Princeton subject headings:
Crimean War, 1853-1856--Causes.
Europe--Foreign relations--Turkey.
Europe--Politics and government--1815-1848.
Turkey--Foreign relations--Europe.
Turkey--Politics and government--1829-1878.