@misc{_Zur_1831,
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={1831},
 publisher={[s.n.]},
 language={ger},
 title={Zur Erstürmung von Warschau am 6ten und 7ten September 1831},
 keywords={street maps, warfare maps, Warsaw street maps, 19th century},
}