@misc{_Geologische_1929,
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 howpublished={online},
 year={1929},
 publisher={Königl. Preuss. Landesaufnahme},
 title={Geologische Karte 1:25 000 - 2256 Guben},
 keywords={mapa geologiczna},
}