The directory includes over 5000 family archives and personal writings bequests or parts of archives and bequests covering half a millennium of Austrian history. For the first time not only the holdings of Austrian archives, libraries or museums were taken into account, but also institutions in the Czech Republic, Hungary, Slovakia, Germany, Italy, Poland, Slovenia, Croatia, Romania, the Ukraine, Switzerland, the USA and Israel. The reference work thus offers an unprecedented concentrated overview of often untapped source treasures.