Columbia subject headings:
Harvard subject headings:
China--Commerce--Japan--Ryukyu Islands.
China--History--Qing dynasty, 1644-1912.
Ryukyu Islands--Commerce--China.
Ryukyu Islands--History.
Princeton subject headings:
China--Commerce--Ryukyu Islands.
China--History--Qing dynasty, 1644-1912.
Ryukyu Islands--Commerce--China.
Ryukyu Islands--History.