Hi, Marcel
leonventer has posted a detailed list on the work of kampfgeschwaders'operations over normandy, and to the best of my knowledge, no other english books have been published about luftwaffe's bomber wings during the allies' invasion of normandy. however, there're still some non-english books u may get smth useful
KG 2
Der Luftkrieg in Europa: Die operativen Einsätz des Kampfgeschwaders 2 im Zweiten Weltkrieg by Ulf Balke
KG 6
Über allen Fronten: Chronik des Kampfgeschwader 6 by Jan Horn
KG 26
Achtung — Torpedos los by Rudi Schmidt
Die Spur des Löwen: Der Weg des Löwengeschwaders durch Europa by Alexander Steenbeck
KG 54
Kampfgeschwader 54: Von der Ju 52 zur Me 262 by Siegfried Radtke
KG 100
Kampfgeschwader 100 "Wiking" by Ulf Balke
La Kampfgeschwader 100 L'escadre au Drakkar by Jean-Loius Roba
and plus this book: Hitler's Spyplane over Normandy 1944 by Philippe Bauduin, if u don't mind there were actually only some basic reconnaissance missions over normandy by a flight of blitz bombers.
for more details about these books, tell me and i'll find them out from my fully stuffed bookcase
))
best regards from shanghai