Philadelphia seen: two centuries of ophthalmology.
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D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009144:Museums / Q000266:history*; D009885:Ophthalmology / Q000266:history*; D019721:Ophthalmoscopes; D009887:Ophthalmoscopy / Q000266:history; D015143:Philadelphia; D012955:Societies, Medical