Mein Kampf in the original edition (German, presumably printed in black letter typeface) was supposedly dictated to Rudolf Hess, I presume as a typescript, though this has been denied. There seems to be no way to separate out the possible adjustments made to Hitler's words. Volume 1 was written while Hitler was imprisoned in Bavaria: there was a separatist Bavarian movement against Prussia (i.e. Roman Catholic south vs Protestant north), no doubt encouraged by Jews, which was 'about to become fact'; Ludendorff and Hitler opposed it in November 1923, with a group of men, of whom 16 died. In November 1923, the NSDAP was forbidden, and in February 1924 Hitler was sentenced to five years, though he was released in December 1925 after which the 2nd volume was published. It's not clear to me how much access Hitler and Hess had to documents and records during the writing process: a few names are mentioned but solid facts are somewhat thin. There was some wrangling over the title. Bear in mind that the book (which went on to sell in large numbers up to wartime) may well have been expected to remain relatively obscure.