@misc{_Mapa_1930,
 editor={Rühle, Edward (1905–1988). Oprac.},
 copyright={Rights Reserved - Restricted Access},
 address={[S.l.]},
 howpublished={online},
 year={1930},
 publisher={Druk W.I.G.},
 language={pol},
 title={Mapa gęstości zaludnienia zachodniego Polesia},
 keywords={population maps, population density, West Polesia},
}