@misc{_Plan_1806,
 editor={Geographisches Institut (Weimar)},
 copyright={Public Domain},
 address={Weimar},
 howpublished={online},
 year={1806},
 publisher={Im Verlage des Geograph. Instituts},
 language={ger},
 title={Plan von Madrid},
 type={Image},
 keywords={street maps, Madrid street maps, Madrid, 19th century},
}