Portrait of Alexander von Humboldt

Aloys Kessler, 19th century

Joseph von Keller, 19th century

Johann Gottlieb Abraham Frenzel, 19th century

Johann Gabriel Friedrich Poppel, 19th century

Ferdinand Ruscheweyh, 1827

Moritz Steinla, 19th century

Johann Heinrich Friedr. Ludwig Knolle, 19th century

Moritz Steinla, 19th century

Friedrich Würthle, 19th century

Friedrich August Brückner, 19th century

Friedrich Julius Umbach, 19th century

Eugen Eduard Schäffer, 19th century