@misc{_Petrowitz,
 howpublished={online},
 publisher={Verlag der Simon Schropp'schen Hof -Landkarten Handlung},
 publisher={(Lith. Anst. v. Leopold Kraatz)},
 language={ger},
 title={Petrowitz},
 type={mapa},
 keywords={mapa topograficzna, Piotrowice, Katowice},
}