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Holding Institution
- University of Chicago177
- The Huntington Library, Art Museum, and Botanical Gardens40
- New York University25
- University of Missouri22
- Ohio State University11
- Free Library of Philadelphia10
- University of Pennsylvania10
- Newberry Library9
- Harry Ransom Center5
- Princeton University5
- California State Library3
- Indiana University Bloomington3
- University of California, Berkeley3
- Boston Public Library2
- Cornell University2
- Jewish Theological Seminary of America1
- New York Academy of Medicine1
- Rochester Institute of Technology1
- Rutgers University1
- Science History Institute1