@misc{_Geologische_[b.r.],
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 howpublished={online},
 year={[b.r.]},
 publisher={Preuss. Geologischen Landesanstalt},
 title={Geologische Karte 1:25 000 - 2949 Bolkenhain},
 keywords={mapa geologiczna},
}