Combined Arms Research Library is a treasure trove.
it is, but one must recall that much there on the War in the East is A: dated and largely outperformed in more modern works and B: quite biased towards the German point of view, being either co-authored or created from German interviews and primary source documents alone.
What is needed are those in-depth analyses written after the fall of the Soviet Union and more important,y after the 1996 declassifications of old Soviet records on the war by the FSB.
Although dry reading to say the last, David Glantz' trilogy is still likely to take top spot as a pure analysis of the fighting around Red October Factory complexes.
YMMV of course.
KRL, Jon H