Columbia subject headings:
Harvard subject headings:
China--History--19th century
China--History--20th century
China--History--May Fourth movement, 1919.
China--History--Opium War, 1840-1842
Princeton subject headings:
China--History--19th century.
China--History--20th century.
China--History--May Fourth movement, 1919.
China--History--Opium War, 1840-1842.