Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Comparison between Smallpox and Cow Pox. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.
Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Comparison between Smallpox and Cow Pox. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.