@misc{_Geologische_1928,
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 howpublished={online},
 year={1928},
 publisher={Kgl. Preuss. Landes-Aufnahme},
 title={Geologische Karte 1:25 000 - 2549 Muskau},
 keywords={mapa geologiczna},
}