Columbia subject headings:
Harvard subject headings:
Opium trade--China--Inner Mongolia--History.
Opium trade--Government policy--China--History.
Sino-Japanese War, 1937-1945--China--Inner Mongolia--History.
Princeton subject headings:
Inner Mongolia (China)--Economic conditions--20th century.
Opium trade--Government policy--China--Inner Mongolia--History--20th century.
Sino-Japanese War, 1937-1945--China--Inner Mongolia.