Alexander von Humboldt: Perbedaan antara revisi
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* [http://www.avh.de/en/index.htm The website of the Alexander von Humboldt Foundation] {{Webarchive|url=https://web.archive.org/web/20031202025506/http://www.avh.de/en/index.htm |date=2003-12-02 }}
* {{gutenberg author|id=Alexander+von+Humboldt |name=Alexander von Humboldt}}
* [http://www.avhumboldt.net Humboldt Digital Library] {{Webarchive|url=https://web.archive.org/web/20201125020807/http://avhumboldt.net/ |date=2020-11-25 }}
* [http://www.archive.org/search.php?query=creator%3AAlexander%20Humboldt%20-contributor%3Agutenberg%20AND%20mediatype%3Atexts Works by Alexander von Humboldt] at [[Internet Archive]]
* [http://www.archive.org/details/AlexanderVonHumboldt"Lives of the Brothers Humboldt"] an extensive biography available from the Million Book Project:
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