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Holding Institution
- Harry Ransom Center155
- Newberry Library55
- The Huntington Library, Art Museum, and Botanical Gardens36
- Harvard University30
- University of California, Berkeley20
- University of Chicago18
- University of Pennsylvania15
- Free Library of Philadelphia11
- University of Missouri9
- Western Michigan University8
- Boston Public Library4
- New York University3
- Princeton University3
- Science History Institute3
- Indiana University Bloomington2
- Vassar College2
- Bryn Mawr College1
- General Theological Seminary1
- Jewish Theological Seminary of America1
- University of Kansas1