“…The following sources have been searched and analyzed: the opulent masonic sources of the ancient Prussian lodges of the Geheimes Staatsarchiv Preußischer Kulturbesitz, Berlin-Dahlem, having been made available since 1990; the sources of the Orde van vrijmetselaren onder het Grootoosten der Nederlanden, Den Haag, of the Den danske Frimurerorden, Kopenhagen, of the Landesarchiv Berlin, of the Landesarchiv Magdeburg - Landeshauptarchiv, the Brandenburgisches Landeshauptarchiv, Potsdam, the Stadtarchiv Potsdam, the Thüringisches Hauptstaatsarchiv, Weimar, the Österreichisches Staatsarchiv, department Haus-, Hof- und Staatsarchiv, Vienna, as well as the libraries of the Deutsches Freimaurer-Museum, Bayreuth, the Great Lodge of Freemasons of Germany, Berlin, the Great National Mother Lodge "To the Three Globes" in Berlin, the Biblioteka uniwersytecka w Poznaniu, Pracownia Zbiorów Masonskich, Poznan, and the Great Lodge of the Old Free and Accepted Freemasons of Austria, Vienna. …”