https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13982592
Yellow fever: a scientist wearing a face mask works at a laboratory bench with bunsen burners and microscopes. Photograph, 1910/1930 .
Yellow fever: a scientist wearing a face mask works at a laboratory bench with bunsen burners and microscopes. Photograph, 1910/1930 .
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use