Columbia subject headings:
Harvard subject headings:
Germany--History--1933-1945.
Germany. Luftwaffe--History--World War, 1939-1945.
World War, 1939-1945--Aerial operations, German.
Princeton subject headings:
Germany--History--1933-1945.
Germany. Luftwaffe--History--World War, 1939-1945.
World War, 1939-1945--Aerial operations, German.