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Holding Institution
- University of Pennsylvania300
- Harvard University73
- University of California, Berkeley35
- University of Kansas28
- Boston Public Library20
- Harry Ransom Center14
- Free Library of Philadelphia10
- The Huntington Library, Art Museum, and Botanical Gardens9
- Cornell University8
- California State Library3
- Princeton University3
- Indiana University Bloomington2
- Science History Institute2
- Wellesley College2
- New York Academy of Medicine1
- Saint Louis University1
- University of California, Davis1
- University of Missouri1
- University of Oregon1
- Vassar College1