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Titles
- NLM entries in The British Library incunabula short-title catalogue and a concordance of Schullian, Klebs, and Goff numbers1
- Narcotic addiction: a selected list of references in English1
- National Library of Medicine recommended formats for bibliographic citation1
- National Library of Medicine recommended formats for bibliographic citation: Supplement : Internet formats1
- National Library of Medicine's motion pictures and videocassettes about the Public Health Service and its agencies1
- Nitrogen 15 in biological research: a preliminary list of references to 1 August 19511
- Nota di alcuni giornali di medicina e atti di societe mediche che vorrebbe acquistare la Biblioteca di medicina diretta dal Chirurgo-Generale del Esercito degli Stati Uniti a Washington nel Distretto di Columbia (Stati Uniti d'America)1