Columbia subject headings:
Harvard subject headings:
Bashkortostan (Russia)--History.
Historiography--Soviet Union
Ural Mountains Region (Russia)--History.
Volga River Valley (Russia)--History.
Princeton subject headings:
Bashkortostan (Russia)--History.
Historiography--Soviet Union.
Ural Mountains Region (Russia)--History.
Volga River Valley (Russia)--History.