@misc{Rivero_Mariano_de_(1798-1857)_Brief,
 author={Rivero, Mariano de (1798-1857) and Humboldt, Alexander von (1769-1859)},
 howpublished={online},
 language={fre},
 type={rękopis},
 title={Brief von Mariano de Rivero an Alexander von Humboldt},
 keywords={rękopisy},
}