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Humboldts Arbeitszimmer. Alexander von Humboldt in seiner Bibliothek andere Versionen Aquarell von Eduard Hildebrand de Ireas CommonsHelper Berlin br Anja Wellenreich de PDold Original upload log page de HumboldtsArbeitszimmer Anja Wellenreich bytes no Beschreibung Alexander von Humboldt in seiner Bibliothek Fotograf Lithographie