Columbia subject headings:
Developing countries--Relations--Soviet Union--Congresses.
Soviet Union--Relations--Developing countries--Congresses.
Harvard subject headings:
Developing countries--Relations--Soviet Union--Congresses.
Soviet Union--Relations--Developing countries--Congresses.
Princeton subject headings:
Developing countries--Relations--Soviet Union--Congresses.
Soviet Union--Relations--Developing countries--Congresses.