Columbia subject headings:
Harvard subject headings:
Kaliningradskai︠a︡ oblastʹ (Russia)--History--Chronology.
Kaliningradskai︠a︡ oblastʹ (Russia)--History.
Princeton subject headings:
Kaliningradskai︠a︡ oblastʹ (Russia)--History--Chronology.
Kaliningradskai︠a︡ oblastʹ (Russia)--History.