Columbia subject headings:
Omskai︠a︡ oblastʹ (Russia)--History--Sources.
Harvard subject headings:
Omskai︠a︡ oblastʹ (Russia)--History--Sources.
Princeton subject headings:
Communism--Russia (Federation)--Omskai︠a︡ oblastʹ--History--Sources.
Omskai︠a︡ oblastʹ (Russia)--History--Sources.
Omskai︠a︡ oblastʹ (Russia)--Social conditions--Sources.