Columbia subject headings:
Eastern question (Balkan)
Eastern question (Central Asia)
Eastern question.
Europe--Foreign relations--Middle East.
Geopolitics--Middle East--History--19th century.
Middle East--Foreign relations--Europe.
Middle East--History--19th century.
Harvard subject headings:
Eastern question (Balkan)
Eastern question (Central Asia)
Eastern question.
Europe--Foreign relations--Middle East.
Geopolitics--Middle East--History--19th century.
Middle East--Foreign relations--Europe.
Middle East--History--19th century.
Princeton subject headings:
Eastern question (Balkan)
Eastern question (Central Asia)
Eastern question.
Europe--Foreign relations--Middle East.
Geopolitics--Middle East--History--19th century.
Middle East--Foreign relations--Europe.
Middle East--History--19th century.