Columbia subject headings:
Japan--History, Naval.
Japan--Relations--Korea.
Korea--Relations--Japan.
Pirates--Japan--History.
Seafaring life--Japan--History.
Harvard subject headings:
East Asia--Foreign relations
East Asia--History--To 1500.
Pirates--East Asia--History.
Princeton subject headings:
Japan--History, Naval.
Japan--Relations--Korea.
Korea--Relations--Japan.
Pirates--Japan--History.
Seafaring life--Japan--History.