@misc{Humboldt_Alexander_von_(1769-1859)_Brief, author={Humboldt, Alexander von (1769-1859) and Buschmann, Johann Carl Eduard (1805-1880)}, howpublished={online}, language={ger}, title={Brief von Alexander von Humboldt an Johann Carl Eduard Buschmann}, type={rękopis}, keywords={rękopisy}, }