Only two of Hitler’s intimates kept diaries of interest. Goebbels’s volumes have long provided valuable insights into the gossip, rivalries, and self-serving arguments of the Reich leadership; now we have the thoughts of Alfred Rosenberg. This splendid volume is the result of years of effort by the United States Holocaust Memorial Museum (USHMM) to locate and secure more than 400 pages of loose-leaf paper covering the years 1936 through 1944, as Rosenberg rose from the Nazi Party’s ideologue and author of The Myth of the Twentieth Century (1930) through his appointment as ruler of the Occupied Eastern Territories in July 1941, thus ushering in the wholesale programs of looting and mass murder. This remarkable and important book is the result of a partnership with Munich’s well-known Institut für Zeitgeschichte. Rosenberg’s diary, translated into English by Matthäus (USHMM) and Bajohr, from the Munich Institute, is supported by lengthy footnotes, illuminated by 60 pages of additional documents from the Museum’s voluminous holdings, and put in context with pages of related sources. Admirably, the book is being digitally prepared for online access. A valuable resource that belongs in every collection on the Third Reich and the Holocaust. Summing Up: Essential. All levels/libraries.