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Holding Institution
- Harry Ransom Center155
- Harvard University28
- The Huntington Library, Art Museum, and Botanical Gardens20
- University of California, Berkeley17
- University of Pennsylvania13
- Free Library of Philadelphia10
- University of Missouri9
- Western Michigan University8
- Boston Public Library3
- New York University3
- Indiana University Bloomington2
- Princeton University1
- Science History Institute1
- University of Kansas1
- Vassar College1