https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14017867![Friedrich Hoffmann I. Line engraving.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djeGtzNWRzMnEtaW1hZ2UuanBn.jpg)
![Friedrich Hoffmann I. Line engraving.](https://images.rawpixel.com/image_social_portrait/cHJpdmF0ZS9sci9pbWFnZXMvd2Vic2l0ZS8yMDI0LTAyL2xyL3djeGtzNWRzMnEtaW1hZ2UuanBn.jpg)
Friedrich Hoffmann I. Line engraving.
Friedrich Hoffmann I. Line engraving.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use