Columbia subject headings:
Harvard subject headings:
Aeronautics, Military--Germany--History--Pictorial works.
Germany. Luftwaffe--History--Pictorial works.
World War, 1939-1945--Aerial operations, German.
Princeton subject headings:
Aeronautics, Military--Germany--History--Pictorial works.
Germany. Luftwaffe--History--Pictorial works.
Germany. Luftwaffe. Legión Cóndor--History--Pictorial works.