Columbia subject headings:
Korea (North)--Foreign relations--United States.
Nuclear nonproliferation.
United States--Foreign relations--Korea (North)
Weapons of mass destruction--Korea (North)
Harvard subject headings:
Korea (North)--Foreign Relations--United States.
Nuclear nonproliferation.
United States--Foreign relations--Korea (North)
Weapons of mass destruction--Korea (North)
Princeton subject headings:
Korea (North)--Foreign relations--United States.
Nuclear nonproliferation.
United States--Foreign relations--Korea (North)
Weapons of mass destruction--Korea (North).