Columbia subject headings:
Harvard subject headings:
Architecture--Russia (Federation)--Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ)
Oka River Valley (Kurskai︠a︡ oblastʹ-Nizhegorodskai︠a︡ oblastʹ, Russia)--History.
Princeton subject headings:
Architecture--Russia (Federation)--Oka River Valley.
Oka River Valley (Kurskai︠a︡ oblastʹ-Gorʹkovskai︠a︡ oblastʹ, Russia)--Description and travel.