@misc{_Plan_[ante,
 copyright={Public Domain},
 address={Königsber},
 howpublished={online},
 year={[ante 1930]},
 publisher={Hartungsche Verlagsdruckerei},
 language={ger},
 title={Plan der Stadt Königsber},
 keywords={street maps, Kaliningrad street maps, Kaliningrad, 20th century},
}