^Interesting, at least with some of the thinner Panzer Division histories the reader is at the gates of Moscow at the middle of the book if not already past of it. I can understand why some books focus the later part of the war. Probably most of survivors, and potential readers, were those who fought during the later part of the war. Not so many of those serving 1939 -41 were alive in 1946. Many of the German unit histories were wrote in 50s and 60s, so it was easier to get diaries, photos, recollections and interviews from those who participated in those retreat battles.