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For the past 175 years, the The National Library of Medicine in Bethesda has been building the world’s largest collection of biomedical images, artifacts, and ephemera. With more than 17 million items spanning ten centuries, it’s a treasure trove of rare, obscure, extravagant wonders, most of which remain unseen by the public and unknown even to historians, librarians, and curators. Until now. Hidden Treasure , following on the heels of The Art of Medicine , is an exquisite large-format volume that culls some of the most fascinating, surprising, beautiful, gruesome, and idiosyncratic objects from the Library’s collection in 450 full-color illustrations. From rare “magic lantern slides” doctors used to entertain and cure inmates at the St.

