Billings in cyberspace: toward the electronic Index-Catalogue.
Maulitz
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D002381:Catalogs, Library; D003195:Computer Communication Networks; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008523:MEDLARS / Q000266:history*; D009317:National Library of Medicine (U.S.) / Q000266:history; D014481:United States