Abstract: The INDXR platform is a tool for electronically processing manuscript sources. Th is article is a written version of a paper presented at the seminar organised in 2023 by the Commission of Historical Geography of the Polish Historical Society and the Varsavianist Research Team of the Tadeusz Manteuff el Institute of History, Polish Academy of Sciences. It discusses using this platform while processing the fi ve oldest Kalisz city books from the collection of the State Archives in Poznań. It also presents the method of working with the sources and using its results in the volume of the Historical Atlas of Polish Citiesdedicated to Kalisz.

The full article is available exclusively in Polish.