Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Japan.
Japan--Foreign relations--China.
Japanese--China--History--20th century.
Opium trade--China--History
Tientsin, China (Japanese Concession)
Princeton subject headings:
China--Foreign relations--Japan.
Japan--Foreign relations--China.
Japanese--China--History--20th century.
Opium trade--China--History--20th century.
Tientsin, China (Japanese Concession)