Librariogenesis and libraricide: the Philadelphia connection.
D049672:History, 19th Century; D049673:History, 20th Century; D007993:Libraries, Medical / Q000191:economics / Q000266:history / Q000331:legislation & jurisprudence; D009317:National Library of Medicine (U.S.) / Q000266:history; D010414:Pennsylvania; D012955:Societies, Medical; D014481:United States