@misc{[Roulin_Francois_Desiré_(1796-1874)]_Brief,
 author={[Roulin, Francois Desiré (1796-1874)] and Humboldt, Alexander von (1769-1859)},
 howpublished={online},
 language={fre},
 type={rękopis},
 title={Brief von Francois Desiré Roulin an Alexander von Humboldt},
 keywords={rękopisy},
}