from Bernhard Kumsteller's Werden und Wachsen: Ein Geschichtsatlas auf Völkischer Grundlage (Braunschweig, 1938)
according to https://www.reddit.com/r/MapPorn/comments/2yf8qo/baffling_nazi_school_map_claiming_all_major/ which has the same image.
"Great" (horrible but fascinating) . Not only a nazi school atlas, but a nazi atlas nazi vocabulary in the title who tries to explain history entirely through nazi ideology.