Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Great Britain.
China--History--Opium War, 1840-1842
Great Britain--Foreign relations--China.
Opium trade--China--History--19th century.
Princeton subject headings:
China--Foreign relations--Great Britain.
China--History--Opium War, 1840-1842.
Great Britain--Foreign relations--China.
Opium trade--China--History--19th century.