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Holding Institution
- University of Pennsylvania62
- Princeton University24
- New York Academy of Medicine9
- The Huntington Library, Art Museum, and Botanical Gardens8
- University of Chicago6
- Free Library of Philadelphia5
- Columbia University Rare Book & Manuscript Library4
- University of California, Berkeley3
- Bryn Mawr College2
- Harvard University2
- Newberry Library2
- Boston Public Library1
- Harry Ransom Center1
- Science History Institute1