Columbia subject headings:
Harvard subject headings:
Korea (North)--Boundaries--Korea (South)--History.
Korea (South)--Boundaries--Korea (North)--History.
Korea--Territories and possessions--History.
Korean Demilitarized Zone (Korea)--History.
Princeton subject headings:
Korea (North)--Boundaries--Korea (South).
Korea (South)--Boundaries--Korea (North).
Territorial waters--Korea (North).
Territorial waters--Korea (South).