@misc{_Voenno-topografičeskaâ_[ca,
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={[ca 1856]},
 publisher={[s.n.]},
 language={rus},
 title={Voenno-topografičeskaâ karta okrestnostej Varšavy},
 keywords={topographical maps, Warsaw region, 19th century},
}