Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Japan--Ryukyu Islands.
Japan--Foreign relations--Japan--Ryukyu Islands.
Ryukyu Islands--Foreign relations--China.
Ryukyu Islands--Foreign relations--Japan.
Ryukyu Islands--History--To 1879.
Princeton subject headings:
Ryukyu Islands--History--To 1879.
Ryukyu Islands--Relations--Foreign countries.