@misc{_Karte_1915,
 editor={Niemcy. Heer. Generalstab. Kartographische Abteilung},
 copyright={Public Domain},
 address={[Berlin]},
 howpublished={online},
 year={1915},
 publisher={[s.n.]},
 language={ger},
 language={pol},
 language={rus},
 title={Karte der Umgegend von Warschau},
 keywords={topographical maps, Warsaw region},
}