@misc{_Plan_[ca,
 copyright={Public Domain},
 address={[S.l.]},
 address={(Warszawa)},
 howpublished={online},
 year={[ca 1916]},
 publisher={[s.n.]},
 publisher={(Zakł. Graf. "Technograf")},
 language={pol},
 title={Plan miasta Warszawy},
 type={Image},
 keywords={street maps, Warsaw, Warsaw street maps, 20th century},
}