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Holding Institution
- University of Chicago714
- Harry Ransom Center36
- The Huntington Library, Art Museum, and Botanical Gardens30
- University of Missouri7
- Free Library of Philadelphia6
- University of Pennsylvania6
- Newberry Library5
- Boston Public Library4
- University of California, Berkeley4
- New York University3
- Princeton University3
- Science History Institute2
- Indiana University Bloomington1