https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13976543Edit ImageSaveSaveEditCropCustom TextFriedrich Heinrich Alexander von Humboldt. Lithograph by R. Hoffmann, 1857, after Schwartz & Zschille.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 839 x 1200 px | 300 dpiLarge JPEG 2443 x 3493 px | 300 dpiFree DownloadFriedrich Heinrich Alexander von Humboldt. Lithograph by R. Hoffmann, 1857, after Schwartz & Zschille.More