@misc{Martínez_de_Pinillos_Claudio_(1780-1853)_Brief,
 author={Martínez de Pinillos, Claudio (1780-1853) and Humboldt, Alexander von (1769-1859)},
 howpublished={online},
 language={spa},
 type={rękopis},
 title={Brief von Claudio Martínez de Pinillos an Alexander von Humboldt},
 keywords={rękopisy},
}