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Holding Institution
- Harry Ransom Center59
- The Huntington Library, Art Museum, and Botanical Gardens32
- Newberry Library10
- University of Missouri9
- Western Michigan University8
- University of California, Berkeley7
- University of Pennsylvania7
- Free Library of Philadelphia6
- University of Chicago4
- Boston Public Library3
- New York University3
- Princeton University3
- Science History Institute3
- Indiana University Bloomington2
- Vassar College2