Alfred Rosenberg was a top aid to Adolf Hitler.<br/> <br />The diary he kept during World War II was a key piece of evidence in the Nuremberg trials.<br/> <br />But the 400-page loose leaf diary was eventually thought lost, and remained lost for 70 years, until now…<br/> <br />It was handed over to the U.S. Holocaust Museum in Washington on Tuesday.<br/> <br />The rediscovery of this importance document can't be overstated, says museum historian Jurgen Mathaus.<br/> <br />(SOUNDBITE) (English) JURGEN MATTHAUS, UNITED STATES HOLOCAUST MUSEUM HISTORIAN, SAYING:<br/> <br />"The persecution of Jews was going through a massive transformation; from massive persecution to annihilation. The very area that he was in charge of is the area where the Holocaust as we know it -- meaning the systematic murder of all Jewish men, women and children -- happened first.<br/> <br />When the Nuremberg trials were over, the diary disappeared.<br/> <br />One of the prosecuting attorneys, it turned out, secretly kept it.<br/> <br />But it went missing fr
