If you meant, "is there a history of NSGr. 6?" - then all there currently is is the entry in Michael Holm's site:
www.ww2.dk. There is a mini-history of the unit in
Dive-Bombers and Ground-Attack units of the Luftwaffe, Volume 2, but this is not scheduled to be released until July 2012.
What did you want to know?
DGS