@misc{_Der_1857,
 editor={Justus Perthes (Gotha)},
 copyright={Public Domain},
 address={Gotha},
 howpublished={online},
 year={1857},
 publisher={Justus Perthes},
 language={ger},
 title={Der Preussische Staat : 11 colorirte Karten in Kupferstich},
 keywords={political-administrative atlases, Prussia, 19th century},
}