@misc{_Plan_1920,
 editor={Ewig, F. Oprac.},
 copyright={Rights Reserved - Restricted Access},
 address={Drohobycz},
 address={(Wiedeń)},
 howpublished={online},
 year={1920},
 publisher={F. Ewig},
 publisher={(drukiem Instytut Wojskowogeograficznego)},
 language={pol},
 language={ger},
 title={Plan kopalń i pól naftowych, gmin Borysław, Tustanowice, Mrażnica = Plan der Naphtag-gruben und -felder der Gemeinden Borysław, Tustanowice, Mrażnica},
 keywords={geological maps, economic maps, crude oil mining, Borysław region, Ukraine},
}