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Continue to ChatPatent medicines in 1938 and now: A.J.Clark's book. https://www.dcscience.net/2008/09/29/patent-medicines-in-1938-and-now-ajclarks-book/
Patent medicines in 1938 and now: A.J.Clark's book. https://www.dcscience.net/2008/09/29/patent-medicines-in-1938-and-now-ajclarks-book/