Columbia subject headings:
Iran--Commerce--Russia--History--18th century.
Iran--Commerce--Russia--History--19th century.
Russia--Commerce--Iran--History--18th century.
Russia--Commerce--Iran--History--19th century.
Harvard subject headings:
Iran--Commerce--History.
Iran--Foreign economic relations--Russia.
Russia--Commerce--History.
Russia--Foreign economic relations--Iran.
Princeton subject headings:
Iran--Commerce--History.
Iran--Foreign economic relations--Russia.
Russia--Commerce--History.
Russia--Foreign economic relations--Iran.