Humboldt an <persName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0006403 http://d-nb.info/gnd/117387436">Karl Ludwig Willdenow</persName>, <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0002516 https://www.geonames.org/3129857">Aranjuez</placeName>, 20. April 1799; <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0011312 https://www.geonames.org/3119841">La Coruña</placeName>, 5. Juni 1799 (<bibl xmlns="http://www.tei-c.org/ns/1.0" corresp="https://edition-humboldt.de/WFDJIWK6">Humboldt 1973</bibl>, 664).