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Scientists --- Professional employees --- Biography --- Correspondence --- Humboldt, Alexander von, --- Humboldtas, Alexandras von, --- Humboldt, Friedrich Wilhelm Heinrich Alexander von, --- Humboldt, Alejandro de, --- Gumbolʹdt, Aleksandr, --- Von Humboldt, Alexander, --- Humboldt, Alexander, --- Humboldt, Alexandre de, --- Humboldt, A. de, --- Humboldt, Al. von, --- Humboldt, --- הומבאלד, אלכסנדר פאן --- History of physics --- Biology --- Regional documentation --- Geography --- Humboldt, von, Alexander --- Latin America