Columbia subject headings:
Harvard subject headings:
Fighter planes--Germany.
Fighter planes--Soviet Union.
Messerschmitt Bf 109 (Fighter plane)
Polikarpov I-16 (Fighter plane)
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Aerial operations, Russian.
Princeton subject headings:
Aeronautics, Military--Germany--History.
Aeronautics, Military--Soviet Union--History.
Fighter planes--Germany.
Fighter planes--Soviet Union.
Messerschmitt Bf 109 (Fighter plane)
Polikarpov I-16 (Fighter plane)
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Aerial operations, Russian.