Columbia subject headings:
Eastern question (Balkan)
Europe--Politics and government--1871-1918.
Great Britain--Foreign relations--1837-1901.
Great Britain--Foreign relations--1901-1910.
Great Britain--Foreign relations--Russia.
Russia--Foreign relations--Great Britain.
Triple Entente, 1907.
Harvard subject headings:
Europe--Foreign relations--1871-1918.
Europe--Politics and government--1871-1918.
Great Britain--Foreign relations--1837-1901.
Great Britain--Foreign relations--1901-1910.
International relations--History
World War, 1914-1918--Causes
Princeton subject headings:
Europe--Foreign relations--1871-1918.
Europe--Politics and government--1871-1918.
Great Britain--Foreign relations--1837-1901.
Great Britain--Foreign relations--1901-1910.
International relations--History.
World War, 1914-1918--Causes.