@misc{Spiker_Samuel_Heinrich_(1786-1858)_Brief,
 author={Spiker, Samuel Heinrich (1786-1858) and Humboldt, Alexander von (1769-1859)},
 howpublished={online},
 language={ger},
 language={fre},
 title={Brief von Samuel Heinrich Spiker an Heinrich Karl Wilhelm Berghaus},
 type={rękopis},
 keywords={rękopisy},
}