Columbia subject headings:
Korea (North)--Economic conditions.
Korea (North)--Foreign relations--United States.
Korea (North)--Politics and government.
United States--Foreign relations--Korea (North)
Harvard subject headings:
Korea (North)--Economic conditions
Korea (North)--Foreign relations--United States.
Korea (North)--Politics and government.
United States--Foreign relations--Korea (North)
Princeton subject headings:
Korea (North)--Economic conditions.
Korea (North)--Foreign relations--United States.
Korea (North)--Politics and government.
United States--Foreign relations--Korea (North)