Columbia subject headings:
Permskai︠a︡ gubernii︠a︡ (R.S.F.S.R.)
Permskai︠a︡ oblastʹ (Russia)--Economic conditions.
Permskai︠a︡ oblastʹ (Russia)--Politics and government.
Harvard subject headings:
Permskai︠a︡ oblastʹ (Russia)
Permskai︠a︡ oblastʹ (Russia)--Economic conditions.
Permskai︠a︡ oblastʹ (Russia)--Politics and government.
Princeton subject headings: