Columbia subject headings:
Kaluga (Kaluzhskai︠a︡ oblastʹ, Russia)--History--Congresses.
Harvard subject headings:
Kaluga (Kaluzhskai︠a︡ oblastʹ, Russia)--History--Congresses.
Princeton subject headings:
Kaluga (Kaluzhskai︠a︡ oblastʹ, Russia)--History--Congresses.