The Red Army Handbook 1939-1945 fills a number of gaps in my knowledge of Soviet units. The only other source I've had for this data is the "War in the East" study done by the staff of Strategy and Tactics Magazine. The Handbook provides info on the Red Army similar to the War Department's "Handbook on German Military Forces", but without limiting the scope of information to the latter half of WWII. I can't emphasize the presence of TO&E info from '39-'41 enough, which the histories have hinted at, but no book I've found (before now) detailed. The knowledge I've gained from the Red Army Handbook has enhanced my (re-)readings of the various histories of the Soviet-Nazi conflict. I consider the Red Army Handbook a vital and essential addition to my library.
From Amazon.com
A-#1 new book on the Red Army of the Great Patriotic War
An excellent new book on the Red Army. This volume contains detailed information on the TO&E (Tables of Organization and Equipment) for Soviet ground forces in the Second World War. The focus of the book is very tight; the changing Soviet unit organization, and Soviet army weapons. Don't look here for tactical doctrine or operational history! I do wish that there was more discussion of Lend-Lease weapons and vehicles, particularly in terms of delivery quantities and dates, and more on Soviet radios and soft-skinned transport vehicles. Nevertheless, a must-have item for Red Army affectionadoes.