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- Library of Congress. Division of Bibliography23
- United States. Department of Labor. Library9
- United States. Office of Education8
- Bolton, Henry Carrington, 1843-19037
- Library of Congress7
- University of Illinois at the Medical Center. Library of the Health Sciences7
- Columbus Memorial Library5
- Dix, E. R. McC. (Ernest Reginald McClintock), 1857-19365
- National Library of Medicine (U.S.)5
- Severance, Frank H. (Frank Hayward), 1856-19315
- United States. Bureau of Labor Statistics5
- Bodleian Library4
- Choulant, Ludwig, 1791-18614
- Grolier Club4
- Horne, Thomas Hartwell, 1780-18624
- Library of Congress. Map Division4
- Merck & Co4
- United States. Bureau of the Census4
- United States. Department of State. Bureau of Rolls and Library4
- Water Resources Scientific Information Center4