https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13999545Edit ImageSaveSaveEditCropCustom TextJohann, Ritter von Oppolzer. Lithograph by A. Dauthage, 1859, after J.M. Aigner.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 759 x 1200 px | 300 dpiLarge JPEG 2124 x 3359 px | 300 dpiFree DownloadJohann, Ritter von Oppolzer. Lithograph by A. Dauthage, 1859, after J.M. Aigner.More