@misc{_Karta_[ca,
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={[ca 1862]},
 publisher={[s.n.]},
 language={rus},
 title={Karta Plockoj gubernìi},
 keywords={chorographic maps, political-administrative maps, Płock region, 19th century},
}