@misc{Ledru_André_Pierre_(1761–1825)_Charte_1814,
 author={Ledru, André Pierre (1761–1825)},
 editor={López de Vargas Machuca, Tomás (1731–1802)},
 editor={Ehnlich, I. F. C. Ryt.},
 editor={Geographisches Institut (Weimar)},
 copyright={Public Domain},
 address={Weimar},
 howpublished={online},
 year={1814},
 publisher={im Verlage des Geogr. Instituts},
 language={ger},
 title={Charte der Insel Puertorico und der Insel Bieque},
 URL={http://www.rcin.org.pl/Content/62337/PDF/WA51_51290_PANDs8805-r1814_Charte-der-Insel-Pue.pdf},
 keywords={chorographic maps, Puerto Rico, 19th century},
}