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Holding Institution
- University of Pennsylvania20
- University of Missouri17
- The Huntington Library, Art Museum, and Botanical Gardens13
- Harry Ransom Center12
- Free Library of Philadelphia9
- University of Kansas5
- Newberry Library4
- Bryn Mawr College3
- Harvard University2
- University of California, Berkeley2
- Boston Public Library1
- Indiana University Bloomington1
- Princeton University1