@misc{Töppen_Max_(1822–1893)_Atlas_1858, author={Töppen, Max (1822–1893)}, copyright={Public Domain}, address={Gotha}, howpublished={online}, year={1858}, publisher={Justus Perthes}, language={ger}, title={Atlas zur historisch-comparativen Geographie von Preussen}, keywords={historical atlases, Prussia, 19th century}, }