I've read quite a few books relating to Soviet aviation for skinning research, but most of these relate to specific battles, aircraft types or manufacturers. The best overall history of the VVS in WW2 I have read is "Soviet Air Power in WW2" by Yefim Gordon. It covers Soviet air forces' unit organisation and history, as well as all the various home-produced and lend lease aircraft they flew. Yefim Gordon also co-wrote "Soviet Combat Aircraft of the Second World War". However this is much like the first book, just without the lend-lease and air force organisation stuff.