@book{108242,
	author = {Humboldt, Alexander von, and Varnhagen von Ense, Karl August,},
	title = {Letters of Alexander von Humboldt to Varnhagen von Ense. :},
	publisher = {Project Gutenberg,},
	year = {2022},
	address = {Salt Lake City, UT :},
	note = {Release date is 2022-02-16},
	url = {https://archive.org/details/alexandlettersof00humbrich}
}