@misc{_Mappa_[post,
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={[post 1846]},
 publisher={[s.n.]},
 language={pol},
 type={Image},
 title={Mappa Leśna Królestwa Polskiego},
 URL={http://rcin.org.pl/Content/418/PDF/WA51_3080_PAN-Ds7931-r1846_Mappa-Lesna-Kr-Pol.pdf},
 keywords={maps of forest distribution, forestry maps, Kingdom of Poland, Poland, 19th century},
}