@misc{_Mapa_[post,
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={[post 1900]},
 publisher={[s.n.]},
 language={pol},
 language={eng},
 title={Mapa poglądowa kopalń i szybów naftowych Borysław - Tustanowice skala : 1:20 000},
 title={The oilfields of Boryslaw - Tustanowice Galicia scale : 1:20 000},
 keywords={geological maps, economic maps, crude oil, Borysław, Tustanowice, region of Borysław, oil fields, oil mining, 20th century},
}