Staatsarchiv des Kantons Thurgau

The State Archives are the largest repository of information on the history and present of the Canton of Thurgau, accessible to everyone. Its holdings (16,000 linear metres) range from the year 1125 to the year 2020, and its reference library (12,000 volumes) contains, among other things, an almost complete collection of literature on Thurgau. https://query-staatsarchiv.tg.ch/suchinfo.aspx