Columbia subject headings:
Harvard subject headings:
Japan--Foreign relations--Asia.
Okinawa-ken (Japan)--History.
Ryukyu Islands--Foreign relations--Asia.
Ryukyu Islands--History.
Princeton subject headings:
Japan--Foreign relations--Asia.
Okinawa-ken (Japan)--History.
Ryukyu Islands--Foreign relations--Asia.
Ryukyu Islands--History.