Uffz.Johann Kalb 9/JG52

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Hello

I have several questions about the events of 16/09/42.
From on of my sources (French),Johann Kalb claimed a Su-2 of 270 BAP ("abschuss"n°32).
Then he was shot down by a P-40 (Petr Selyutin of 731°IAP),himself shot down by Hermann Graff.

From Tony Wood:
a)no claim by Kalb
b)Su-2 claimed by Graff:Quadrat 49271 (zone of Stalingrad)
c)P-40 claimed by Graff:Quadrat 40882

The Quadrat 40882 and 49271 seems distant from each other...right?
According C.Bergstrom,no P-40 and Su-2 were lost in the 8VA and 16VA.

If anyone has answers?
Michel