Александър фон Хумболт: Разлика между версии
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* {{cite book | last=Bleichmar | first = Daniela| title=Visible Empire: Botanical Expeditions and Visual Culture in the Hispanic Enlightenment | publisher=University of Chicago Press | location=Chicago London | year=2012 | isbn=978-0-226-05853-5 | ref=harv}}
* {{ cite book | last=Brading | first=David | author-link=David Brading | year=1991 | chapter=Chapter 23. Scientific Traveller | title=The First America : the Spanish Monarchy, Creole Patriots, and the Liberal State, 1492-1867 | location=New York | publisher=Cambridge University Press | isbn=0-521-39130-X | ref=harv}}
* {{ cite book | last=de Terra | first=Helmut
* {{cite book |last1=Dickinson|first1=Robert Eric |last2=Howarth |first2=O. J. R.|year=1933 |title=The Making of Geography |url=https://archive.org/details/makingofgeograph009224mbp |edition=online Universal Digital Library, facsimile of original |location=Oxford |publisher=Clarendon Press |oclc=9640382 | ref=harv}}
* Harvey, Eleanor Jones. (2020) ''Alexander von Humboldt and the United States''. Washington DC: Smithsonian American Art Museum. {{ISBN|978-0-691-20080-4}}
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