Columbia subject headings:
Ryukyu Islands--Research--Sources.
Harvard subject headings:
Europe--Relations--Japan--Ryukyu Islands--Sources.
Ryukyu Islands--Civilization--Sources.
Ryukyu Islands--History--Sources.
Ryukyu Islands--Relations--Europe--Sources.
Ryukyu Islands--Research--Sources.
Ryukyu Islands--Study and teaching.
Princeton subject headings:
Ryukyu Islands--Research--Sources.