A quick comment about Beevor, i'd be a bit careful about him as i do get the impression he has a thing of omitting details here and there.
Otherwise, a good book on the Eastern front is War without Garlands by Robert Kershaw, really nice book on Operation Barbarossa.
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Sadly i forgot to do it in time My bad luck i fear. Looks interesting though and i'm likely to buy it. In particular if reasonably priced and easily accessable on something like steam