Columbia subject headings:
Harvard subject headings:
Germany. Luftwaffe. Kampfgeschwader "Legion Condor" 53.--History.
World War, 1939-1945--Aerial operations, German.
Princeton subject headings:
Germany. Luftwaffe. Kampfgeschwader "Legion Condor" 53--History.
World War, 1939-1945--Aerial operations, German.