Columbia subject headings:
Caucasus--Relations--Russia.
Iran--Foreign relations--Russia--Sources.
Russia--Foreign relations--Iran--Sources.
Russia--Relations--Caucasus.
Harvard subject headings:
Caucasus--Relations--Russia.
Iran--Foreign relations--Russia--Sources.
Russia--Foreign relations--Iran--Sources.
Russia--Relations--Caucasus.
Princeton subject headings:
Caucasus--Relations--Russia--Sources.
Iran--Relations--Russia--Sources.
Russia--Relations--Caucasus--Sources.
Russia--Relations--Iran--Sources.