Columbia subject headings:
Bulgars (Turkic people)
Golden Horde.
Kazanskoe khanstvo--History.
Mongols--History.
Tatarstan (Russia)--History.
Volga River Region (Russia)--History.
Harvard subject headings:
Princeton subject headings:
Asia, Central--History.
Bulgars (Turkic people)--History.
Golden Horde--History.
Mongols--History.
Tatars--History.