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Holding Institution
- University of Pennsylvania49
- Princeton University15
- The Huntington Library, Art Museum, and Botanical Gardens8
- New York Academy of Medicine7
- Free Library of Philadelphia5
- University of Chicago5
- University of California, Berkeley3
- Bryn Mawr College2
- Columbia University Rare Book & Manuscript Library2
- Boston Public Library1
- Harry Ransom Center1
- Harvard University1
- Science History Institute1