I have this on vhs...26 episodes and an extra one with Hitler's secretary...the dvd editions have extras such as, "the making of world at war'", the restoratipon of 'world at war'" and the like...most any of the dvd editions will be good...It is interesting because as they made it during the early 1970's on 16mm, many of the principal participants were still alive, such as Albert Speer, admiral Karl Dönitz, and others.
It's also interesting that they made this series before they released the details about Enigma.