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It is impossible for me to write books just by reading other people’s books. I gather as complete a set of the related documents as possible. This is my metier. Unfortunately, the Hitler biography is a rather larger subject than I had thought. I have thirteen linear feet of diaries, reports, interrogations, etc.; 2,100 pages of Trevor-Roper’s Papers; the private papers of Canaris, Keitel, Koller, Jodl, Milch, von Waldau, Himmler, Assmann, Morell, Goebbels, Hitler (Reichskanzlei), Hewel, Linge, Bormann, Speer (2,000 pages), Hoepner, von Weichs, von Bock, Beck, etc., etc. I went to Washington and read the German Naval Staff War Diary from 1939–1945, over 70 volumes, each containing 400 pages. I have typed 150,000 words onto 600 filing cards.
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