Humboldt an <persName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0006403 http://d-nb.info/gnd/117387436">Willdenow</persName>, <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0006819 https://www.geonames.org/3553478">Havanna</placeName>, 21. Februar 1801 (ehp: <bibl xmlns="http://www.tei-c.org/ns/1.0" corresp="https://edition-humboldt.de/JXPPLBG5">Humboldt 2020</bibl>, 115, 1r–1v; <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://edition-humboldt.de/H0001181">https://edition-humboldt.de/H0001181</ref>) – Vgl. den Brief Humboldts an <persName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0006403 http://d-nb.info/gnd/117387436">Willdenow</persName>, <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0006819 https://www.geonames.org/3553478">Havanna</placeName>, 4. März 1801 (ebd., 123–124; <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://edition-humboldt.de/H0006053">https://edition-humboldt.de/H0006053</ref>).