World War I: poster for production of box respirators
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: World War I: poster for production of box respirators. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: World War I: poster for production of box respirators. Wellcome Collection. Source: Wellcome Collection.