@software{peter_andorfer_2020_4266194, author = {Peter Andorfer}, title = {acdh-oeaw/histogis-data: Posen Counties 1818-1919}, month = nov, year = 2020, publisher = {Zenodo}, version = {v8.0}, doi = {10.5281/zenodo.4266194}, url = {https://doi.org/10.5281/zenodo.4266194} }