@misc{_Geologische_1930,
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 howpublished={online},
 year={1930},
 publisher={Königl. Preuss. Landes-Aufnahme},
 title={Geologische Karte 1:25 000 - 3306 Bischofstal},
 keywords={mapa geologiczna},
}