Columbia subject headings:
Harvard subject headings:
Japan--History--To 645
Japan--Relations--Karak (kingdom)
Kaya (Confederation)
Kaya (Confederation)--Relations--Japan.
Princeton subject headings:
Japan--History--To 645.
Japan--Relations--Karak (kingdom).
Kaya (Confederation)--History.
Kaya (Confederation)--Relations--Japan.