Columbia subject headings:
Harvard subject headings:
Ri︠a︡zanskai︠a︡ gubernii︠a︡ (R.S.F.S.R.)--History.
Ri︠a︡zanskai︠a︡ oblastʹ (Russia)
Ri︠a︡zanskai︠a︡ oblastʹ (Russia)--History.
Ri︠a︡zanʹ (Russia)
Princeton subject headings:
Ri︠a︡zanskai︠a︡ oblastʹ (Russia)--History.