@misc{_Karte_[1831],
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 howpublished={online},
 year={[1831]},
 publisher={s.n.},
 language={ger},
 title={Karte des Deutschen Reiches 1:100 000 - 427. Landsberg a.d. Prosna},
}