@misc{Rivero_Mariano_de_(1798-1857)_Brief, author={Rivero, Mariano de (1798-1857) and Humboldt, Alexander von (1769-1859)}, howpublished={online}, language={fre}, type={rękopis}, title={Brief von Mariano de Rivero an Alexander von Humboldt}, keywords={rękopisy}, }