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hiddentreasure, nationallibraryofmedicine, georgemayerle, visiontest, lithograph, imagesfromthehistoryofmedicine, ihm, freeonlineresource, visualmedia, fineart, photographs, engravings, posters, “socialandhistoricalaspectsofmedicine”, “digitalcollections””, “biomedicalresources, ”books, videos, maps, “printsandphotographs”, pp, nlm, historyofmedicinedivision, hmd, “nationalinstitutesofhealth”, nih, eyeglasses, spectacle, “readingglasses”, “polishinglenses”, lenses, “eyeexamination”, ophthalmology, vision, ocular, view, perception, seeing, monocle, eye, “visualreceptor”, optic, “convexlenses”, “concavelenses”, “refraction, “transmissionofimages”, optical, “humaneye”, stillimage, eyewear, publicdomain, archivesofmedicine, nlmdigitalcollection
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