"A comparison between vaccinated (cowpox) and smallpox pustules from the 3rd to 20th day of the disease. Coloured etching by W. Skelton after W. Cuff."
"A comparison between vaccinated (cowpox) and smallpox pustules from the 3rd to 20th day of the disease. Coloured etching by W. Skelton after W. Cuff."