When the Russians overran Berlin in 1945 they went through the German official archives with more vigour than discrimination.  Some material was shipped to Russia, some was destroyed and the rest scattered and trampled.  The pages of Goebbel’s diary were found in the ministry courtyard, having narrowly escaped burning.  Seven thousand sheets of unburnt paper was salvaged by an amateur junk dealer, who salvaged the official document binders and made random bundles of the paper.  To get the diary in order was a Herculean task.  Here is not only the diary, but other odd documents of Goebbel’s life:  receipts, drafts of speeches, expense accounts, lists of charity donations and letters.