Columbia subject headings:
Azerbaijan--Foreign economic relations--Soviet Union--History.
Azerbaijan--History.
Caspian Sea Region--Commerce--History.
Diplomatic and consular service, Soviet--Azerbaijan--History.
Russia--Foreign relations--1689-1801.
Soviet Union--Foreign economic relations--Azerbaijan--History.
Harvard subject headings:
Diplomatic and consular service, Soviet--Iran.
Iran--Foreign relations--Russia.
Iran--Foreign relations--Soviet Union.
Russia--Foreign relations--1689-1801.
Russia--Foreign relations--Iran.
Soviet Union--Foreign relations--Iran.
Princeton subject headings:
Diplomatic and consular service, Russian--Iran.
Iran--Foreign relations--Russia.
Russia--Foreign relations--1689-1801.
Russia--Foreign relations--Iran.