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Author/Creator
- ebrary, Inc527
- Medcom, inc., production company242
- United States242
- Inter-university Consortium for Political and Social Research181
- Project Muse171
- ProQuest (Firm)118
- United States Department of Health and Human Services. National Center for Health Statistics97
- Clements C. Fry Collection of Medical Prints and Drawings (Yale Medical Library, Historical Library)87
- United States. Department of Health and Human Services. Office of Inspector General, author87
- Library of Congress. Congressional Research Service, issuing body74
- National Cancer Institute (U.S.)72
- National Center for Health Statistics (U.S.)69
- United States. Congress. Senate. Special Committee on Aging68
- Job Accommodation Network (U.S.)61
- National Center for Health Statistics (U.S.), issuing body61
- Project Muse. distributor57
- National Institutes of Health (U.S.)55
- Films for the Humanities & Sciences (Firm)52
- Infobase52
- United States. Administration on Aging43