“…The main sources for this research were in the Masonic papers and documents of the ancient Prussian lodges, preserved at the Geheimes Staatsarchiv Preußischer Kulturbesitz, Berlin-Dahlem, the sources of the Austrian State Archive, Department Haus-, Hof- und Staatsarchiv, Vienna, a series of other archives and libraries, the Masonic literature as well as the relevant literature on regional, social and biographical history. …”