Columbia subject headings:
Mongolia--Relations--Soviet Union.
Science--International cooperation.
Science--Mongolia.
Science--Soviet Union.
Soviet Union--Relations--Mongolia.
Harvard subject headings:
Mongolia--Relations--Soviet Union.
Science--International cooperation
Science--Mongolia.
Science--Soviet Union.
Soviet Union--Relations--Mongolia.
Princeton subject headings:
Mongolia--Relations--Soviet Union.
Science--International cooperation.
Science--Mongolia.
Science--Soviet Union.
Soviet Union--Relations--Mongolia.