@misc{Ideler_Julius_Ludwig_(1809-1842)_Brief, author={Ideler, Julius Ludwig (1809-1842) and Humboldt, Alexander von (1769-1859)}, howpublished={online}, language={ger}, language={fre}, title={Brief von Julius Ludwig Ideler an Alexander von Humboldt}, type={rękopis}, keywords={rękopisy}, }