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21. Past, present, and future of biomedical information

23. An evidence-based health care system: the case for clinical trials registries : Office of Medical Applications of Research, National Institutes of Health [and] National Library of Medicine, Lister Hill Auditorium, Bethesda, Maryland, December 6-7, 1993

24. Improving health professionals' access to information: challenges and opportunities for the National Library of Medicine

25. Improving health professionals' access to information: report of the Board of Regents