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- SpringerLink (Online service)178
- United States. Congress. House168
- Films for the Humanities & Sciences (Firm)120
- Infobase120
- United States120
- ebrary, Inc116
- Infobase, film distributor87
- Medcom, inc., production company70
- United States. Dept. of the Treasury69
- Library of Congress. Congressional Research Service67
- World Health Organization49
- United States. Public Health Service48
- Frank, Jon41
- Clements C. Fry Collection of Medical Prints and Drawings (Yale Medical Library, Historical Library)39
- United States. Commissioners of the District of Columbia (1874-1967)31
- United States. Congress. Senate31
- BBC Worldwide Ltd30
- Centers for Disease Control and Prevention (U.S.)30
- District of Columbia. Health Department27
- National Institute of Allergy and Infectious Diseases (U.S.)27