Columbia subject headings:
Harvard subject headings:
Kaliningrad (Kaliningradskai︠a︡ oblastʹ, Russia)--History.
World War, 1939-1945--Campaigns, Eastern.
World War, 1939-1945--Campaigns--Germany (East)
Wrocław (Poland)--History.
Princeton subject headings:
Kaliningrad (Kaliningradskai︠a︡ oblastʹ, Russia)--History.
World War, 1939-1945--Campaigns--Eastern Front.
World War, 1939-1945--Campaigns--Germany (East)
Wrocław (Poland)--History.