Columbia subject headings:
Korea (North)--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Korea (North)
Harvard subject headings:
Korea (North)--Relations--Soviet Union.
Soviet Union--Foreign relations--1953-1975.
Soviet Union--Relations--Korea (North)
Princeton subject headings:
Korea (North)--Relations--Soviet Union.
Soviet Union--Foreign relations--1953-1975.
Soviet Union--Relations--Korea (North).