| Unidentified photographer Back of trade card advertising X-Zalia medicine. Includes testimonial from Lottie Collins, dated 1894. Stamped: "W.D. Grace, Apothecary, Market Square, Portsmouth, N.H." n.d. Cabinet card, back The New York Academy of Medicine William H. Helfand Collection of Pharmaceutical Trade Cards, Id: WH386B LL/125758
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