@misc{_Pharus-Plan_[ca,
 copyright={Rights Reserved - Restricted Access},
 address={Berlin},
 howpublished={online},
 year={[ca 1911]},
 publisher={Lith. u. Druck des Pharus-Verlag G.m.b.H., Lindenstr. 3},
 language={ger},
 title={Pharus-Plan Königshütte O./Sch},
 title={Pharus-Plan Königshütte Ober/ Schlesien},
 keywords={street maps, Chorzów street maps, Chorzów, 20th century},
}