@misc{Walckenaer_Charles_A._(1771-1852)_Brief,
 author={Walckenaer, Charles A. (1771-1852)},
 howpublished={online},
 language={fre},
 type={rękopis},
 title={Brief von Charles A. Walckenaer an Alexander von Humboldt},
 keywords={rękopisy},
}