Columbia subject headings:
Harvard subject headings:
Poland--History--Occupation, 1939-1945
Warsaw (Poland)--History.
World War, 1939-1945--Poland--Warsaw.
World War, 1939-1945--Poland.
World War, 1939-1945--Underground movements--Poland.
Princeton subject headings:
Poland--History--Occupation, 1939-1945.
Warsaw (Poland)--History.
World War, 1939-1945--Poland--Warsaw.
World War, 1939-1945--Poland.
World War, 1939-1945--Underground movements--Poland.