@misc{Barth_Heinrich_(1821-1865)_Brief,
 author={Barth, Heinrich (1821-1865) and Humboldt, Alexander von (1769-1859)},
 howpublished={online},
 language={ger},
 language={fre},
 type={rękopis},
 title={Brief von Heinrich Barth an Alexander von Humboldt},
 keywords={rękopisy},
}