Columbia subject headings:
Iran--History--640-1500.
Mongols--History.
Seljuks--Turkey--History.
Turkey--History--To 1453.
Turkmen--History.
Harvard subject headings:
Iran--History--640-1500.
Seljuks--Turkey--History.
Turkey--History--To 1453.
Turkmen--History
Turks--History
Princeton subject headings:
Iran--History--640-1500.
Mongols--History.
Seljuks--Turkey--History.
Turkey--History--To 1453.
Turkmen--History.