@misc{_Ethnographical,
 howpublished={online},
 publisher={Cartographical Bureau of the "Polish Encyclopedia"},
 language={eng},
 type={mapa},
 title={Ethnographical map of prussian Poland. Drawn by O. Kudrewicz and T. Skowroński},
 keywords={Polska 20w., Pomorze Gdańskie, Wielkopolska, mapy etnologiczne},
}