Columbia subject headings:
Harvard subject headings:
Rotterdam (Netherlands)--History--Bombardment, 1940.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Netherlands--Rotterdam.
Princeton subject headings:
Rotterdam (Netherlands)--Bombardment, 1940.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Netherlands--Rotterdam.