Columbia subject headings:
China--History--Opium War, 1840-1842.
Opium trade--China.
Opium trade.
Harvard subject headings:
China--History--Opium War, 1840-1842
Noncitizens--China
Opium trade--China
Princeton subject headings:
China--History--Opium War, 1840-1842.
Opium trade.