Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Ryukyu Islands.
Okinawa-ken (Japan)--History.
Ryukyu Islands--Civilization--Chinese influences.
Ryukyu Islands--Foreign relations--China.
Ryukyu Islands--History.
Princeton subject headings:
China--Foreign relations--Japan.
Japan--Foreign relations--China.
Ryukyu Islands--History--To 1879.