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Holding Institution
- Harry Ransom Center102
- The Huntington Library, Art Museum, and Botanical Gardens34
- Harvard University25
- Newberry Library24
- University of Chicago17
- Free Library of Philadelphia11
- University of California, Berkeley9
- University of Pennsylvania9
- University of Missouri7
- Boston Public Library4
- New York University3
- Princeton University3
- Science History Institute2
- Bryn Mawr College1
- General Theological Seminary1
- Indiana University Bloomington1
- University of Kansas1