Ephemera: Walter A Walling. Registered pharm
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Ephemera: Walter A Walling. Registered pharm. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Ephemera: Walter A Walling. Registered pharm. Wellcome Collection. Source: Wellcome Collection.