Columbia subject headings:
Isabu, active 505-562.
Tok Island (Korea)
Tok Island (Korea)--History--Errors, inventions, etc.
Tok Island (Korea)--International status.
Tok Island (Korea)--Study and teaching--Japan.
Harvard subject headings:
Isabu, active 505-562
Japan--Foreign relations--Korea
Korea--Foreign relations--Japan
Territory, National--Japan
Territory, National--Korea.
Tok Island (Korea)--History
Princeton subject headings: