Columbia subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Warsaw (Poland)--History--Sources.
World War, 1939-1945--Poland--Warsaw Region.
Harvard subject headings:
Warsaw (Poland : Voivodeship)--History--Sources.
Princeton subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Warsaw (Poland)--History--Sources.
World War, 1939-1945--Poland--Warsaw region.