Columbia subject headings:
Kaliningradskai︠a︡ oblastʹ (Russia)--History.
Harvard subject headings:
Kaliningradskai︠a︡ oblastʹ (Russia)--History.
Princeton subject headings:
Kaliningradskai︠a︡ oblastʹ (Russia)--History.
Soviet Union--History--1925-1953.