Alexander von Humboldt : Tofauti kati ya masahihisho
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== Viungo vya nje ==
{{Commons|Alexander von Humboldt}}
* [http://www.avh.de/en/index.htm The website of the Alexander von Humboldt Foundation] {{Wayback|url=http://www.avh.de/en/index.htm |date=20031202025506 }}
* {{gutenberg author| id=Alexander+von+Humboldt | name=Alexander von Humboldt}}
* [http://www.archive.org/search.php?query=creator%3AAlexander%20Humboldt%20-contributor%3Agutenberg%20AND%20mediatype%3Atexts Works by Alexander von Humboldt] at [[Internet Archive]]
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