Columbia subject headings:
Germany--History--Bombardment, 1940-1945.
World War, 1939-1945--Aerial operations.
World War, 1939-1945--Germany.
Harvard subject headings:
Germany--History--Bombardment, 1940-1945.
World War, 1939-1945--Aerial operations
World War, 1939-1945--Germany.
Princeton subject headings:
Germany--History--Bombardment, 1942-1945.
World War, 1939-1945--Aerial operations.
World War, 1939-1945--Germany.