- Author: Alexander von Humboldt (editor), Vera M. Kutzinski (editor), Ottmar Ette (editor)
- Language: English
- Year: 2011
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- Language: English
- Year: 2014
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- Language: English
- Year: 2010
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- Author: Wilhelm von Humboldt (editor), Alexander von Humboldt (editor)
- Language: German
- Year: 1853