Columbia subject headings:
Russian language--Dialects--Russia (Federation)--Tverskai︠a︡ oblastʹ.
Harvard subject headings:
Russian language--Dialects--Russia (Federation)--Tverskai︠a︡ oblastʹ--History.
Russian language--Dialects--Russia (Federation)--Tverskai︠a︡ oblastʹ.
Princeton subject headings: