Mao's Little Red Book is way up there, too, if not vying for number one.
Jihadist who have read “Mein Kamph” have not killed 80,000,000 to qualify. Nor will they. Point of fact it has taken the jihadis since 628 AD to present to murder 240,000,000 - just slightly more that Mao and Jughashvili combined murdered in 70 years. Hitler and “Mein Kamph” are pikers in the murder business.
Little Red book is the undisputed number one, with number two - the hard to impossible to find “Autobiography of Joseph Vissarionovich Jughashvili - the Man of Steel” and his documented 62,000,000 murdered.