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HGIS Germany (Andreas Kunz, Leonhard Dietze). IEG-Maps / Berlin Data Pool (Andreas Kunz, Robert Moeschl). Institut fur Europaische Geschichte (Mainz, Rhineland-Palatinate, Germany). Fachhochschule Mainz (Mainz, Rhineland-Palatinate, Germany). (2007). Germany Governmental District Boundaries, 1850, German Historical GIS. [Shapefile]. HGIS Germany. https://hgl.harvard.edu/catalog/harvard-ghgis1850districts