https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13981568Edit ImageSaveSaveEditCropCustom TextFriedrich Heinrich Alexander von Humboldt. Etching after Baron C. von Steuben, 1815.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 872 x 1200 px | 300 dpiLarge JPEG 1217 x 1674 px | 300 dpiFree DownloadFriedrich Heinrich Alexander von Humboldt. Etching after Baron C. von Steuben, 1815.More