Columbia subject headings:
Communism--Developing countries.
Developing countries--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Developing countries.
Harvard subject headings:
Communism--Developing countries
Developing countries--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Developing countries.
Princeton subject headings:
Communism--Developing countries.
Developing countries--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Developing countries.