I'm looking for good historical books about the eastern front during the second world war. I tend to enjoy the more in-depth analyses. For anyone similarly interested I would recommend the works of David Glantz. His books are a little older, but often quoted by newer sources, and in his book on Barbarossa he has the English translations of the Fuhrer directives and orders issued during that campaign. Robert Kirchubel also has published an excellent detailed analysis of Barbarossa. I would be especially interested in any books regarding operation, or case, Blue (Fall Blau) if anyone knows of any.