https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13991348Edit ImageSaveSaveEditCropCustom Text7th International Congresses on Tropical Medicine and Malaria, Rio de Janeiro: four scientists. Photograph, 1963.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGSmall JPEG 1200 x 827 px | 300 dpiLarge JPEG 3368 x 2320 px | 300 dpiFree Download7th International Congresses on Tropical Medicine and Malaria, Rio de Janeiro: four scientists. Photograph, 1963.More