Columbia subject headings:
Orenburgskai︠a︡ oblastʹ (Russia)--Historiography.
Orenburgskai︠a︡ oblastʹ (Russia)--History.
Harvard subject headings:
Orenburgskai︠a︡ oblastʹ (Russia)--Historiography.
Orenburgskai︠a︡ oblastʹ (Russia)--History.
Princeton subject headings: