@misc{Kopernicki_Walery_(1819–1895)_Mapa_1882,
 author={Kopernicki, Walery (1819–1895)},
 copyright={Public Domain},
 address={Varšava},
 howpublished={online},
 year={1882},
 publisher={[s.n.]},
 language={pol},
 title={Mapa hydrograficzna dawnej słowiańszczyzny : część zachodnio-pólnocna},
 keywords={hydrographical maps, Central Europe, 19th century},
}