@misc{Guckel_Marg._III.,
 author={Guckel, Marg.},
 address={[S.l.]},
 howpublished={online},
 publisher={[s.n.]},
 language={ger},
 title={III. Oberschlesien nach dem Homannschen Atlas 1736},
 keywords={historia, Śląsk Górny, 18 w., kartografia, mapy},
}