Columbia subject headings:
Caucasus--Foreign relations--Iran--Sources.
Iran--Foreign relations--Caucasus--Sources.
Harvard subject headings:
Caucasus--Foreign relations--Iran--Sources.
Iran--Foreign relations--Caucasus--Sources.
Princeton subject headings:
Caucasus--Foreign relations--Iran--Sources.
Iran--Foreign relations--Caucasus--Sources.
Iran--Foreign relations--Sources.
Iran--History--Qajar dynasty, 1794-1925--Sources.