https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13976773Edit ImageSaveSaveEditCropCustom TextNikolai Dmitrievich Zelinsky. Process print, 1951, after drawing by K. Iuon, 1923.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 795 x 1200 px | 300 dpiLarge JPEG 2262 x 3413 px | 300 dpiFree DownloadNikolai Dmitrievich Zelinsky. Process print, 1951, after drawing by K. Iuon, 1923.More