@misc{_Mapa_post,
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={post 1913]},
 publisher={[s.n.]},
 language={pol},
 language={fre},
 language={eng},
 language={ita},
 language={ger},
 title={Mapa etnograficzna Pomorza i Poznańskiego wydana w r. 1913 przez "Ostmarkenverein"},
 keywords={population maps, ethnographic maps, Pomerania, Wielkopolska Region, 20th century},
}