Search Only Images Download this image Portrait of Alexander von Humboldt No info available for book source. Image ID: SIL-SIL14-h006-03 Supplied Caption: Portrait of Alexander von Humboldt. Engraving by Conrad Cook, 19th C., published by William Mackenzie. After Emma Gaggiotti-Richards, 1825-1912. Tags: biology, geology, Humboldt, Alexander von (1769-1859) Categories: Science Collection(s): Scientific Identity No Copyright - United States Request copy of image How can I use this image?