Columbia subject headings:
Harvard subject headings:
China--Commerce--Japan--Ryukyu Islands--History.
China--Foreign relations--Japan--Ryukyu Islands.
Ryukyu Islands--Commerce--China--History.
Ryukyu Islands--Foreign relations--China.
Princeton subject headings:
China--Commerce--Ryukyu Islands--History.
China--Foreign relations--Ryukyu Islands.
Ryukyu Islands--Commerce--China--History.
Ryukyu Islands--Foreign relations--China.