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Calvert's Curative Powder. 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
Calvert's Curative Powder. Public Domain Mark. Source: Wellcome Collection.
Magazine insert issued by F. C. Calvert & Co. advertising Calvert's Curative Powder, and various Calvert-branded dental products.
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