@misc{_Geologische_1921,
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 howpublished={online},
 year={1921},
 publisher={Topogr. Aufnahme des Preuss. Generalstabes},
 title={Geologische Karte 1:25 000 - 3070 Krummhübel},
 keywords={mapa geologiczna},
}