Columbia subject headings:
Harvard subject headings:
Iran--Boundaries--Russia.
Iran--Boundaries--Soviet Union.
Russia--Boundaries--Iran.
Soviet Union--Boundaries--Iran.
Princeton subject headings:
Former Soviet republics--Boundaries--Iran.
Iran--Boundaries--Former Soviet republics.
Iran--Boundaries--Russia.
Iran--Boundaries--Soviet Union.
Russia--Boundaries--Iran.
Soviet Union--Boundaries--Iran.