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Holding Institution
- University of Pennsylvania41
- Harvard University40
- Free Library of Philadelphia17
- Boston Public Library12
- University of California, Berkeley12
- Harry Ransom Center8
- The Huntington Library, Art Museum, and Botanical Gardens5
- University of Kansas5
- Ohio State University2
- Princeton University2
- Rutgers University2
- University of Missouri2
- General Theological Seminary1
- Indiana University Bloomington1
- Science History Institute1
- University of California, Davis1
- Vassar College1