Александър фон Хумболт: Разлика между версии
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* {{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}}
* {{ cite book | last=Helferich | first=Gerard | year=2004 | title=Humboldt's Cosmos: Alexander von Humboldt and the Latin American journey That Changed the Way We See the World | url=https://archive.org/details/humboldtscosmosa0000helf | location=New York | publisher=Gotham Books | isbn=978-1-59240-052-2 | ref=harv }}
* {{cite book | last=Nicolson | first=Malcolm | year=1995 | chapter=Introduction | title=Personal Narrative of a Journey to the Equinoctial Regions of the New Continent | location=New York | publisher=Penguin Books | isbn=978-0-14-044553-4 | ref=harv | chapter-url-access=registration | chapter-url=https://archive.org/details/personalnarrativ00humb }}
* {{ cite book | last=Rupke | first=Nicolaas | year=2008 | title=Alexander von Humboldt : a Metabiography | location=Chicago | publisher=University of Chicago Press | isbn=978-0-226-73149-0 | ref=harv }}
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