If you find any civilian-accessible work, post it please! I'm sure the rest of the board would like a rundown as well. Best wishes for your son(s).
Also, are there any other noteworthy books on the Russian invasion of Afghanistan?
A PDF of Grau's first book (The Bear Went Over the Mountain) can be found here: it's from National Defense University, so there are no copyright issues.
I met Grau once; to say "he's a large man" is a bit of an understatement. The whole FMSO (Foreign Military Studies Office) out at Leavenworth drew an odd bunch of guys...