There is also Unfinished Victory by Arthur Bryant (1940)

Prominent British historian writes a fairly objective prehistory of WWII. The following year, as the war escalates, he attempts to buy up all copies of his book and destroy them. Called "anti-Semitic" because it talks about the extent of Jewish power and wealth in Weimar Germany.

and if you can read German the 1920s magazine Simplicissimus is archived

http://www.simplicissimus.info/