File:Briefkuvert Alexander von Humboldt 1844.jpg
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![File:Briefkuvert Alexander von Humboldt 1844.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Briefkuvert_Alexander_von_Humboldt_1844.jpg/707px-Briefkuvert_Alexander_von_Humboldt_1844.jpg?20111218205149)
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