@misc{_Plan_1800,
 copyright={Public Domain},
 address={Weimar},
 howpublished={online},
 year={1800},
 publisher={im Verlag des Industrie Comptoris},
 language={ger},
 title={Plan der Kaiserlichen Residenz-Stadt St. Petersburg},
 keywords={street maps, Sankt Petersburg street maps, Sankt Petersburg, 19th century},
}