Alexander von Humboldt an <persName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0001517 http://d-nb.info/gnd/115674667">Carl Sigismund Kunth</persName>, [<placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0005221 https://www.geonames.org/2950159">Berlin</placeName>, Anfang 1849], Bl. 1r (<ref xmlns="http://www.tei-c.org/ns/1.0" target="https://edition-humboldt.de/H0002924">https://edition-humboldt.de/H0002924</ref>).